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- 0001-04-30 (xsd:gMonthDay)
- 0001-05-04 (xsd:gMonthDay)
- 0001-05-13 (xsd:gMonthDay)
- 0001-05-21 (xsd:gMonthDay)
- 0001-05-27 (xsd:gMonthDay)
- 0001-05-31 (xsd:gMonthDay)
- 0001-06-06 (xsd:gMonthDay)
- 0001-07-12 (xsd:gMonthDay)
- 0001-10-23 (xsd:gMonthDay)
- 0.0
- 4200.0
- 4320.0
- 4800.0
- 4620.0
- 54000.0
- The PiLB 39 Type personnel landing craft was lost on this date. (en)
- World War II: The cargo ship was torpedoed and sunk in the Yellow Sea by . (en)
- The K-15/M-17-class river minesweeping launch was sunk on this date. (en)
- World War II: The cargo ship struck a mine and sank off Shanghai, China. (en)
- The MO-4-class patrol vessel was lost on this date. (en)
- World War II: The lighter was sunk by a mine in the Black Sea. (en)
- The Siebel ferry was sunk on this date. (en)
- The Type A Marinefahrprahm was sunk on this date. (en)
- The MO-4-class patrol vessel was lost on this date. (en)
- The PiLB 40 type landing craft was lost on this date. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the coast of Japan by . (en)
- The auxiliary river gunboat was lost on this date. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean west of Kyushu by . (en)
- World War II: The cargo ship was sunk in an air attack at Rabaul, New Guinea. (en)
- World War II: The armed merchant cruiser was bombed and sunk at Livorno by American aircraft. (en)
- World War II: The was shelled and sunk in the Baltic Sea by , , and all . All 41 crew members were lost. The wreck was discovered in 2016, confirming shelling. (en)
- World War II: Convoy ONS 5: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of 35 of her 46 crew. Survivors were rescued by . (en)
- thumb|U-128
World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean by and with the loss of seven of her 54 crew. (en)
- World War II: The was bombed and heavily damaged at Livorno by American aircraft. She was grounded to avoid sinking and was never repaired. There was no casualty. (en)
- World War II: The was beached/wrecked between Palermo, Sicily and Bizerte, Tunisia after being damaged by Allied aircraft. (en)
- World War II: The auxiliary minesweeper, while under tow from engine failure, was bombed by German fighters and grounded in shallow water. (en)
- World War II: Convoy CD 20: The Type C1 cargo ship was torpedoed and sunk in the South Atlantic by . All 69 crew were rescued by and a South African Army rescue boat. (en)
- World War II: The auxiliary guard ship was sunk by German Focke-Wulf Fw 190 fighter-bomber aircraft off Cape Tsyp-Navolok. 51 crew were killed. (en)
- World War II: The transport ship was shelled and sunk in the Mediterranean Sea off Kelibia, Tunisia by , and . There were 73 dead and 30 survivors. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Bay of Biscay north of Cape Finisterre, Spain by a Short Sunderland aircraft of 461 Squadron, Royal Australian Air Force with the loss of all 48 crew. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by a Consolidated PBY Catalina aircraft of the United States Navy with the loss of all 49 crew. (en)
- World War II: Convoy P-512: The Daifuku Maru No. 1-class transport was torpedoed and sunk in the Pacific Ocean by . Two hundred and thirty-two troops and thirteen crewmen were killed. (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and damaged in the Atlantic Ocean with the loss of five of her 47 crew. Survivors were rescued by , which scuttled the ship. (en)
- The MAS 552-class MAS boat was sunk in the Black Sea south of the Crimea in a collision with . (en)
- The Vosper 70-class motor torpedo boat was wrecked in the Mediterranean Sea off Kelibia, Tunisia, with the loss of one crew. (en)
- World War II: The auxiliary minesweeper, a former , was scuttled at Bizerte, Tunisia. (en)
- The Type VIIC submarine collided with and sank in the Atlantic Ocean west of Cape Ortegal, Spain with the loss of nine of her 49 crew. (en)
- World War II: Convoy SC 129: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of the Azores, Portugal by with the loss of three of her 46 crew. Survivors were rescued by . (en)
- World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean north east of Newfoundland by . (en)
- Both un-named Kleinst 42 Type torpedo motor boats built were lost sometime in May. (en)
- World War II: The oil tanker was torpedoed and sunk in the Pacific Ocean off Vanuatu, by . The 63 made it to lifeboats, two crewman killed. (en)
- World War II: The Type IXC submarine was rammed and damaged in the Atlantic Ocean by . She was then shelled and sunk by . All 54 crew took to their lifeboats, but the Admiralty forbade the British ships to rescue them and they subsequently died. (en)
- World War II: The MS 11-class MS boat was sunk off Tunis, Tunisia by Allied aircraft. (en)
- World War II: Convoy TS 37: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Freetown by with the loss of four of her 140 crew. Survivors were rescued by . (en)
- World War II: The Siebelgefäß landing craft was probably bombed and sunk at Marsala. (en)
- World War II: The cargo liner was sunk by mines in the South China Sea off the coast of French Indochina. (en)
- World War II: The was sunk in the Mediterranean Sea by a mine off Bizerte, Tunisia. One crew died of wounds. (en)
- World War II: The tanker was torpedoed and sunk in the Pacific Ocean south of Nouméa, New Caledonia by . Eight crew, three gunners and one passenger were killed. Eighty-five men were rescued by . (en)
- World War II: Convoy TS 37: The cargo ship was torpedoed and damaged in the Atlantic Ocean south west of Freetown by . She was taken in tow by and but capsized and sank the next day at Freetown. All 57 crew survived. (en)
- World War II: The cargo ship was bombed and sunk at Civitavecchia by United States Army Air Forces Boeing B-17 Flying Fortress aircraft of the 2nd and 99th Bomb Groups. (en)
- World War II: The Type B1 submarine was depth charged, shelled and sunk in the Pacific Ocean north east of Chichagof Harbor, Attu Island, Alaska, United States by . Lost with all 95 hands. (en)
- World War II: The ship was sunk at anchor at Gibraltar with limpet mine by Italian frogmen. (en)
- World War II: The tug was torpedoed and sunk off Pizzo Calabro, Italy by . There were 13 dead and 8 survivors. (en)
- World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean north of the Azores, Portugal by with the loss of all 53 crew. (en)
- World War II: The three-masted schooner was shelled and sunk in the Atlantic Ocean by with the loss of eight of her ten crew. Survivors were rescued by . (en)
- World War II: The Sperrbrecher struck a mine in the North Sea off Ameland, Friesland, Netherlands and was beached. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the Kuril Islands by . (en)
- World War II: The Clameur-class minesweeping tug was scuttled sometime in May. (en)
- World War II: The auxiliary gunboat was torpedoed and sunk in the Pacific Ocean by (en)
- World War II: The tanker was torpedoed and sunk in the South Atlantic by . All 44 crew survived. (en)
- World War II: The Type XIV submarine was depth charged and sunk in the Bay of Biscay by a Handley Page Halifax aircraft of 58 Squadron, Royal Air Force with the loss of all 57 crew. (en)
- World War II: The auxiliary oiler was torpedoed and sunk in the Pacific Ocean west of Kyushu by . 35 crewmen killed. (en)
- World War II: Convoy NK 538: The tanker straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean off the coast of North Carolina, United States , by with the loss of two of her 51 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off Miami, Florida, United States by with the loss of 14 of her 25 crew. Survivors were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean north east of Newfoundland by with the loss of all 44 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the Kuril Islands by . (en)
- World War II: The Hakkai Maru-class auxiliary gunboat was torpedoed and sunk in the Pacific Ocean off Ise-Wan, Honshu by . 121 troops and 3 crewmen were killed. 121 survivors were rescued by . (en)
- World War II: The Fuji Maru-class auxiliary gunboat was torpedoed and sunk in the Sulu Sea south of Negros, Philippines by . The submarine commander reported around 75 survivors in the water and ordered to machine-gun them, killing about half, and sinking a lifeboat that opened fire on the submarine. Total casualties are unknown. (en)
- World War II: The Type VIIC submarine was hedgehogged and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by and with the loss of all 47 crew. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south east of Iceland by a Consolidated PBY Catalina aircraft of the United States Navy with the loss of all 46 crew. (en)
- World War II: The PT boat tender, a former gunboat, was bombed and damaged in the Pacific Ocean east south east of San Cristobal Island by Japanese aircraft. All 136 crew were rescued by and . She was scuttled by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by with the loss of all 48 crew. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by a Consolidated B-24 Liberator aircraft of 120 Squadron Royal Air Force with the loss of all 46 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the Aleutian Islands, Alaska, United States by . (en)
- World War II: Convoy HX 243: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of three of her 42 crew. Survivors were rescued by . (en)
- World War II: Convoy SA-25: The Takamisan Maru-class auxiliary transport ship was either torpedoed and sunk by , or by a US mine, off the mouth of Yangtze River . Survivors were rescued by . (en)
- World War II: The was sunk off Cape Zebib, Tunisia by Allied aircraft. (en)
- World War II: The Type IX submarine was depth charged and sunk by with the loss of all 61 crew and two prisoners of war. The latter were the captains of and . (en)
- World War II: Convoy ONS 5: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean south of Cape Farewell, Greenland by with the loss of all 43 crew. (en)
- World War II: Convoy No. 257: The transport was torpedoed and sunk in the Pacific Ocean by . Eighty-one crewmen were killed. (en)
- World War II: The cargo ship was torpedoed and sunk at Apra Harbor, Guam by with the loss of all hands. (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean, east of the Felidhu Atoll in the Maldives at the entrance to One and Half Degree Channel by . Her master was taken as a prisoner of war; four crewmen were killed. (en)
- World War II: The cargo ship was bombed and sunk in the North Sea north of Juist by British aircraft. (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean south of Port St Johns, Cape Colony by with the loss of two of her 44 crew. Survivors were rescued by R-6 . (en)
- World War II: The was depth charged and sunk by a Handley Page Halifax aircraft of 58 Squadron, Royal Air Force. (en)
- World War II: Convoy K-519:The Kochi Maru class auxiliary transport ship was torpedoed and sunk in the Pacific Ocean 75 nms north west of Palau by . Two passengers, 3 gunners and 39 crewmen are killed. (en)
- World War II: The Siebelgefäß landing craft was bombed and sunk at Marsala. (en)
- World War II: The Liberty ship was torpedoed and sunk in the Pacific Ocean off Suva, Fiji by . The lifeboats were machine gunned by I-19 but only one crewman was killed in the sinking. (en)
- World War II: The VAS 201-class submarine chasers were sunk at Palermo, Sicily by Allied aircraft. (en)
- World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by with the loss of all 55 crew. (en)
- The 3,087-gross register ton cargo ship ran aground on Bantam Rock off the coast of Maine and sank nearby in waters up to deep without loss of life, south of Boothbay Harbor, Maine, at . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by a Short Sunderland aircraft of 423 Squadron, Royal Canadian Air Force and also by and with the loss of all 47 crew. (en)
- World War II: The sloop was sunk at Livorno by Allied aircraft. Raised by the Germans, renamed SG 22. (en)
- World War II: The cargo ship was sunk by a mine off Warnemünde, Germany. Two crew were killed. She was raised three months later and repaired. (en)
- World War II: The was bombed and sunk in the port of Cagliari, Sardinia by United States Army Air Force aircraft. The whole crew survived. (en)
- The fishing vessel sank in Skorafjorden, Norway due to overloading. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south east of Iceland by a Lockheed Hudson aircraft of 269 Squadron, Royal Air Force with the loss of all 46 crew. (en)
- World War II: The Type VIIC submarine was depth charged and damaged in the Atlantic Ocean by two Grumman TBM Avenger aircraft based on with the loss of 21 of her 46 crew. She was consequently scuttled due to damage received. (en)
- The was severely damaged by fire at Ferrol. (en)
- The was wrecked off Koivisto. (en)
- The naval trawler was lost on this date. (en)
- The trawler sank in the upper Florida Keys. (en)
- World War II: Convoy LMD 17: The cargo ship was torpedoed and sunk in the Indian Ocean by with the loss of twelve of her 39 crew. Survivors were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean north east of Newfoundland by with the loss of all 47 crew. (en)
- World War II: The trawler was shelled and sunk in the Pacific Ocean by . (en)
- World War II: The ship was sunk at anchor at Gibraltar with Limpet mine by Italian frogmen. (en)
- World War II: The Type A Marinefahrprahm was sunk by Soviet aircraft off Anapa . All aboard were rescued, one of them wounded. (en)
- World War II: The was scuttled at Bizerte. (en)
- World War II: The CAM ship was torpedoed and sunk in the Mediterranean Sea off Algeria by with the loss of five of her 61 crew. Survivors were rescued by and a landing craft tank . (en)
- World War II: The sailing vessel was sunk by a mine in the Mediterranean Sea while sailing from Trapani to Pantelleria. The crew survived the sinking. (en)
- World War II: Convoy SL 128: The cargo ship was torpedoed and sunk in the Atlantic Ocean north east of the Azores, Portugal by with the loss of 23 of her 34 crew. Survivors were rescued by . (en)
- The Standard British WWI C-class cargo ship ran aground on a reef and sank off Chiba Prefecture, Honshu. (en)
- World War II: The was bombed and sunk at Messina, Sicily by United States Army Air Force aircraft. There was no casualty aboard. (en)
- World War II: The auxiliary minesweeper was scuttled at Bizerte, Tunisia. (en)
- World War II: The Type VIIC submarine was sunk in the Atlantic Ocean by a Fairey Swordfish aircraft of 811 Squadron, Fleet Air Arm, based on and by and with the loss of all 48 crew. (en)
- World War II: The San Clemente Maru-class tanker was torpedoed and sunk in the Pacific Ocean south east of Palau by . One crewman was killed. Survivors were rescued by . (en)
- World War II: The Vorpostenboot was torpedoed and sunk in the North Sea off Vlieland, Friesland, Netherlands by Bristol Beaufighter aircraft of Coastal Command. (en)
- World War II: The Bangkok Maru-class armed merchant cruiser was torpedoed and sunk in the Pacific Ocean off Jaluit Atoll, Marshall Islands by . Four hundred and ninety-six troops and six crewmen were killed. Survivors were rescued by . (en)
- World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean ) by with the loss of all 53 crew. (en)
- World War II: The cargo ship was torpedoed and damaged at Porto Torres, Sardinia by . She was bombed and sunk the next day by Royal Air Force aircraft. Scrapped at La Spezia, Liguria in January 1948. (en)
- World War II: The s were sunk at La Goulette, Tunisia by Allied aircraft. (en)
- World War II: The ship was en route from Saint Malo to Guernsey when it was attacked by the Royal Air Force and damaged from St Peter Port harbour, Guernsey Channel Islands (en)
- World War II: The cargo ship was bombed and sunk at Cagliari by United States Army Air Forces bomber aircraft. She was refloated after the war but was sunk in 1946 by a mine while being towed to a naval shipyard for repairs. (en)
- World War II: The Harbour Defence Motor Launch was sunk by a mine off of Bizerte, Tunisia, with the loss of six crew. (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and sunk in the Atlantic Ocean south of Cape Farewell, Greenland by with the loss of fifteen of her 49 crew. Survivors were rescued by . (en)
- World War II: the fishing vessel was sunk by gunfire in the Mediterranean Sea off Asinara Island, Italy by . Seven of her nine crew were killed. (en)
- The self-propelled covered lighter ran aground and sank off Atlantic City, New Jersey. (en)
- World War II: The training hulk, the former French L'Audacieux, was bombed and sunk at Bizerte, Tunisia by British aircraft. (en)
- World War II: The cargo ship struck a mine and sank in Öresund. All fourteen crew survived. (en)
- World War II: Convoy TS 37: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Freetown, Sierra Leone by . All 97 crew were rescued by and . (en)
- World War II: The tanker was torpedoed and sunk by off Vadsø, Norway. 11 of her 26 crew were killed. (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and sunk in the Atlantic Ocean east of Belle Isle, Newfoundland by with the loss of four of her 70 crew. Survivors were rescued by . (en)
- World War II: The Type IXB submarine was depth charged and sunk in the Atlantic Ocean by a Consolidated Liberator aircraft of 86 Squadron, Royal Air Force with the loss of all 52 crew. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean west of Gibraltar by two Lockheed Hudson aircraft of 233 Squadron, Royal Air Force with the loss of all 48 crew. (en)
- World War II: The Type 1940 minesweeper was torpedoed and sunk off Texel by Bristol Beaufighter aircraft of Coastal Command. (en)
- World War II: The auxiliary minesweeper was sunk by Allied aircraft off Katakolo, Greece, with the loss of four lives. (en)
- World War II: The cargo ship was torpedoed and sunk in the North Sea off Texel, North Holland, Netherlands by Bristol Beaufighter aircraft of Coastal Command, Royal Air Force. (en)
- World War II: Convoy BT 14: The tanker was torpedoed and damaged in the Atlantic Ocean east of Fortaleza by . The ship was declared a constructive total loss and was not repaired. (en)
- World War II: The diving/stores ship was strafed by nine Imperial Japanese Navy Mitsubishi A6M Zero fighter aircraft at Millingimbi, Northern Territories, Australia. She caught fire and sank, or drifted ashore. (en)
- World War II: The push barge was sunk by a mine in the Black Sea. (en)
- World War II: The cargo ship struck a mine and sank in the Baltic Sea off Wismar, Germany. (en)
- World War II: The armed launch was captured by and , but she sank from battle damage. (en)
- World War II: The refrigerated cargo liner was torpedoed and sunk in the Atlantic Ocean by with the loss of 19 of the 164 people aboard. Survivors were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by a Handley Page Halifax aircraft of 58 Squadron, Royal Air Force with the loss of all 47 crew. (en)
- World War II: The cargo was bombed and sunk by Lockheed P-38 Lightning aircraft of the United States Army Air Force at La Maddalena, Italy. There was no casualty aboard. (en)
- World War II: The cargo ship was torpedoed and sunk in the Black Sea by . (en)
- World War II: The Siebelgefäß landing craft was bombed and sunk at Pantelleria. (en)
- World War II: The cargo ship was bombed and sunk at Olbia by United States Army Air Forces North American B-25 Mitchell bomber aircraft of the 310th Bombardment Group. (en)
- World War II: The Type VIIC submarine was torpedoed and sunk in the Mediterranean Sea off Toulon, Var, France by with the loss of twenty of her 48 crew. (en)
- World War II: The cargo ship was shelled and sunk in the Mediterranean Sea by . All 16 crew survived. (en)
- World War II: The cargo ship was bombed and sunk by Allied Consolidated B-24 Liberator aircraft off Cape St Vito, Italy. An Italian escort rescued 52 men of the around 80 aboard. (en)
- The U-class submarine sank in the Firth of Clyde with the loss of all 35 crew. She was later salvaged, repaired and re-entered service as HMS Vitality. (en)
- World War II: Convoy ONS 5: The Design 1013 cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of six of the 62 people aboard. Survivors were rescued by . (en)
- World War II: The was sunk east of Tunis, Tunisia by , , and . 133 crew and passengers were killed. There were 83 survivors. (en)
- World War II: The guard ship was bombed and sunk in the Black Sea off Gelendzhik by Junkers Ju 87 aircraft of 1 Fliegerkorps, Luftwaffe. 14 crew were killed. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by a Lockheed Hudson aircraft of 269 Squadron, Royal Air Force with the loss of all 46 hands. (en)
- The 58-foot patrol boat was sunk off the Mary Ann Rocks whistle buoy, Manomet, Massachusetts by an explosion in the engine room. All four crewmen survived. (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of fourteen of her 26 crew. Survivors were rescued by . (en)
- World War II: The Type A Marinefahrprahm was sunk on this date. Salvaged by the Soviets in 1944 and put in service as . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Bay of Biscay by Handley Page Halifax and Short Sunderland aircraft of 10 Squadron, Royal Australian Air Force, and 58 and 228 Squadrons, Royal Air Force with the loss of all 49 crew. (en)
- World War II: The was sunk off Tunis by Allied aircraft. (en)
- World War II: The Type VIIC submarine was sunk in the Atlantic Ocean by a rocket attack from Fairey Swordfish aircraft of 819 Squadron, Fleet Air Arm based on with the loss of 29 of her 46 crew. (en)
- World War II: The s were sunk at Trapani, Sicily by Allied aircraft. Raised, repaired and returned to service 1944–1945. (en)
- The ran aground and was wrecked off Tobruk, Libya. (en)
- World War II: The was bombed and sunk in the Pacific Ocean south west of Rendova, Solomon Islands by American aircraft. (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean off Madang. (en)
- World War II: The torpedo boat was bombed and sunk at Livorno by American aircraft. There was no casualty. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Coffs Harbour, New South Wales, Australia by with the loss of twelve of her 31 crew. Survivors were rescued by . (en)
- World War II: Convoy NC 18: The tanker was torpedoed and sunk in the Atlantic Ocean north of Manatí, Cuba , by with the loss of 23 of her 34 crew. (en)
- World War II: The Type VIIC submarine was attacked with rockets and sunk in the Mediterranean Sea north of Mallorca, Spain by a Lockheed Hudson aircraft of 608 Squadron, Royal Air Force with the loss of 40 of her 49 crew. (en)
- World War II: The cargo ship was torpedoed by British aircraft south of Lista, Norway, and was beached. (en)
- World War II: The Marinefahrpram was shelled in the Mediterranean Sea off Cape Bon, Tunisia. She sank two days later. (en)
- World War II: The coaster was torpedoed and sunk south-east off Lipari, Italy by . There were 48 dead and 46 survivors. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of Cape Palmas, Liberia by with the loss of two of her 46 crew. The captain was taken aboard U-123 as a prisoner of war, other survivors reached land in their lifeboats. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean west of Cape Ortegal, Spain by a Short Sunderland aircraft of 201 Squadron, Royal Air Force with the loss of all 46 crew. (en)
- thumb|Propaganda poster based on the sinking of AHS Centaur
: World War II: The hospital ship was torpedoed and sunk in the Pacific Ocean off Queensland , probably by , with the loss of 332 of the 396 people aboard. (en)
- World War II: The A-2 -class motor torpedo boat was sunk by German Focke-Wulf Fw 190 fighter-bomber aircraft off Cape Tsyp-Navolok. Two crew were killed. (en)
- World War II: The was sunk at Bizerte, Tunisia by Allied aircraft. (en)
- World War II: Convoy ONS 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 53 of her 78 crew. Survivors were rescued by and . (en)
- World War II: Convoy R-09: The Shinko Maru-class auxiliary collier/oiler was torpedoed and sunk in the Pacific Ocean north east of Manus Island by . Two crewmen were killed. (en)
- World War II: Convoy SC 129: The cargo ship was torpedoed and sunk in the Atlantic Ocean by . All 36 crew were rescued by . (en)
- World War II: The was heavily damaged by American aircraft off Tunisia and was grounded. Six crew were killed. She was scuttled at the small fishing port of Korbous the next day. (en)
- World War II: The Siebel ferry was bombed and sunk off Marsala. (en)
- World War II: The Marinefahrpram was shelled in the Mediterranean Sea off Cape Bon. She sank two days later. (en)
- World War II: The Vorpostenboot was torpedoed and sunk in the North Sea off Borkum by Bristol Beaufighter aircraft of Coastal Command with the loss of 5 lives. (en)
- World War II: The auxiliary vessel was sunk by gunfire off Asinara Island, Italy by . There were six dead and 29 survivors. (en)
- World War II: The Liberty ship torpedoed and sunk in the South Atlantic south east of Ascension Island by . All 71 people aboard were rescued by a United States Army rescue boat. (en)
- World War II: The Type A Marinefahrprahm was sunk by Allied aircraft off Capo Granitola, Sicily. Seven crew were killed. The 12 survivors were rescued by MAS 544 . (en)
- The armed yacht was wrecked on a breakwater at the entrance to Port Kembla, New South Wales. (en)
- The Fairmile B motor launch was destroyed in a fire off the west coast of Scotland with the loss of one crew. (en)
- World War II: The was depth charged and sunk in the Atlantic Ocean west of Portugal by and (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and sunk in the Atlantic Ocean by . All 92 crew were rescued by . (en)
- World War II: The Type VIIC submarine was sunk at Kiel in an American air raid. There were no casualties. She was subsequently raised, repaired and returned to service. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean east of Cape Farewell, Greenland by with the loss of all 47 crew. (en)
- The Type VIIC submarine collided with in the Atlantic Ocean west of Cape Ortegal and sank with the loss of 44 of her 47 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of one of her 39 crew. Her captain was taken aboard U-182 as a prisoner of war. (en)
- World War II: The was sunk by a mine in the Baltic Sea off Petershof with the loss of 39 crew. There were 5 survivors. She was raised and scrapped in 1944. (en)
- World War II: Convoy NC 18: The tanker was torpedoed and sunk in the Atlantic Ocean north of Manati by . All 31 crew were rescued by a Cuban submarine chaser. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 25 of her 39 crew. One crew member was taken aboard U-105 as a prisoner of war. Other survivors were rescued by a Consolidated PBY Catalina aircraft of 270 Squadron, Royal Air Force. (en)
- World War II: The passenger ship was torpedoed and sunk in the Mediterranean Sea by with the loss of 137 lives. The 147 survivors were rescued by and . (en)
- World War II: The patrol boat was sunk by a mine off Cape Myskhako in the Black Sea. Six of her 22 crew were killed. (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed, shelled and sunk in the Atlantic Ocean south of Cape Farewell, Greenland by with the loss of seven of her 49 crew. Survivors were rescued by . (en)
- World War II: The Type A Marinefahrprahm was sunk by Soviet aircraft off Anapa . All crew were rescued, one of them wounded. (en)
- World War II: The Type VIIC submarine was depth charged and damaged in the Bay of Biscay west of Brest, Finistère, France by Short Sunderland aircraft of 10 Squadron, Royal Australian Air Force. She sank the next day with the loss of all 49 crew. (en)
- The naval trawler struck an iceberg and sank under tow the next day in the Atlantic Ocean south of Greenland . Six of her 48 crew died. (en)
- World War II: The Type A Marinefahrprahm was sunk by Allied aircraft in the port of Pantelleria. (en)
- The Sh-4 Type motor torpedo boat was lost on this date. (en)
- World War II: Convoy TS 38: The cargo ship was torpedoed and sunk in the Atlantic Ocean south of Monrovia, Liberia by with the loss of 66 of her 71 crew. Survivors were rescued by . (en)
- World War II: The auxiliary patrol boat was sunk by a mine in the Baltic Sea. (en)
- World War II: The ship straggled behind her convoy and foundered in the Atlantic Ocean north east of Cape Charles, Virginia. Thirty-one people were rescued by but 31 others were lost. (en)
- World War II: The tanker was torpedoed and damaged off Vero Beach, Florida by with the loss of two of her 47 crew. Survivors abandoned ship, and were rescued by . Java Arrow was later towed into Port Everglades, Florida. Subsequently repaired and returned to service in 1943 as Kerry Patch. (en)
- World War II: The M-class submarine was sunk off the Rybachiy Peninsula by Focke-Wulf Fw 190 aircraft of Jagdgeschwader 5, Luftwaffe, with the loss of all 22 crew. (en)
- World War II: The ore carrier struck a mine and sank in the Baltic Sea off Rügen, Germany. There was no casualty. (en)
- World War II: The Siebel ferry was bombed and sunk at Pantelleria. (en)
- World War II: The naval trawler/submarine chaser was shelled and sunk in the Mediterranean Sea off Monaco by . There were 46 dead and 70 survivors. (en)
- World War II: Convoy No. 3207: The Peking Maru-class auxiliary transport ship was torpedoed and sunk in the Sulu Sea south of Negros, Philippines by . Twelve crewmen were killed. Between the Indus Maru and Meikai Maru sinkings, 1,648 survivors were rescued by . (en)
- The 101-gross register ton, fishing vessel sank in the Shumagin Islands in the Territory of Alaska. (en)
- World War II: The sailing vessel was sunk by gunfire off Kos, Greece by . The three crew survived the sinking. (en)
- World War II: The tug was sunk in the Black Sea off Sochi by and with the loss of 21 lives. (en)
- World War II: Convoy No. 3207: The cargo ship was torpedoed and sunk in the Sulu Sea south of Negros by . Between the Indus Maru and Meikai Maru sinkings, 1,648 survivors were rescued by . (en)
- World War II: The cargo ship was sunk by Allied aircraft off Reggio di Calabria, Italy. She was salvaged in September, repaired and entered Italian service in 1944 as Capo Faro. (en)
- World War II: The Kamikawa Maru-class seaplane tender was torpedoed and damaged in the Pacific Ocean 225 miles north north west of Kavieng, New Ireland by She was finished off by USS Scamp in the early hours of the next day. Thirty-nine crewmen and three Imperial Japanese Army civilian employees were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mozambique Channel by with the loss of 75 of the 230 people aboard. Survivors were rescued by Portuguese fishing vessels. (en)
- World War II: Convoy ONS 5: The Design 1013 cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean south of Cape Farewell, Greenland by . All 61 crew were rescued by . (en)
- World War II: The was disabled by a mine and then sunk by aircraft near Kolombangara. (en)
- World War II: Convoy 4508: The transport was torpedoed and damaged in the Pacific Ocean east of Saipan by . Only one crew was killed. About 400 troops and passengers were rescued by Tatsutake Maru that was sunk some hours later. Kinai Maru was shelled and sunk by USS Plunger the next day . (en)
- The cargo ship, requisitioned by the French, then under German command, carrying a cargo of bombs, was wrecked on Grune aux Dardes, Nantes, Loire Atlantique. (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of six of her 46 crew. Survivors were rescued by . (en)
- World War II: Convoy 4508: The ammunition ship was torpedoed and sunk in the Pacific Ocean east of Saipan by . Four crewmen and many former passengers of Kinai Maru were killed. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean west of Cape Ortegal, Spain by and with the loss of all 47 crew. (en)
- The S 501-class motor torpedo boat was sunk in a collision in the Black Sea off Feodosia. (en)
- World War II: The tanker was torpedoed and sunk in the Pacific Ocean by . Two crewmen were killed. The 63 survivors were rescued by . (en)
- World War II: Convoy ONS 5: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of ten of her 49 crew. Survivors were rescued by . Harperley later sank at ). (en)
- World War II: The sailing vessel was damaged beyond repair by gunfire south of San Lucido, Italy by . The crew survived, only one was wounded. (en)
- World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean by Handley Page Halifax aircraft of 58 Squadron, Royal Air Force and with the loss of eleven of her 56 crew. (en)
- thumb|Irish Oak after being torpedoed by U-607, painting by Kenneth King, National Maritime Museum of Ireland
World War II: The Design 1019 cargo ship was torpedoed and sunk in the Atlantic Ocean by . All 33 crew were rescued by . (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean off Madang with the loss of 18 lives. (en)
- World War II: The LCT Mk 5 was sunk at Algiers, Algeria by an underwater explosion. (en)
- World War II: The tugboat was bombed and sunk in the Black sea by a Soviet Naval Air Force Douglas A-20 Havoc aircraft. (en)
- The landing craft vehicle blew up during exercises off west Scotland. One crew was killed. (en)
- World War II: The struck a mine in the Mediterranean Sea off Cape Bon, Tunisia. One crew died of wounds. She was declared a constructive total loss. (en)
- World War II: Convoy HX 237: The tanker straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of twenty of her 39 crew. Survivors were rescued by . (en)
- World War II: Convoy HX 237: The Fort ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of 37 of her 56 crew. Survivors were rescued by and . (en)
- World War II: The cargo ship was captured in the Indian Ocean by . The 23 crew were ordered to abandon ship, after which she was scuttled. (en)
- World War II: Convoy BT 14: The cargo ship was torpedoed and damaged in the Atlantic Ocean east of Fortaleza, Brazil by . Her back broken, she was abandoned by her 69 crew, who were rescued by . Florida was taken in tow by . She was later repaired and returned to service. (en)
- World War II: The cargo ship was bombed and sunk off Olbia, Sardinia, Italy by Allied aircraft. She was raised in 1946 but sank whilst under tow to Genoa. (en)
- World War II: The LCT Mk 5 struck a mine and sank in the Mediterranean Sea. (en)
- World War II: The auxiliary minelayer was scuttled at Bizerte, Tunisia. (en)
- World War II: The tanker was torpedoed and sunk in the Atlantic Ocean off Jupiter Inlet, Florida by . All 32 crew were rescued by American fishing vessels. (en)
- World War II: The Vorpostenboot was sunk in the North Sea off Terschelling, Friesland, Netherlands in a battle with , , , , , and . (en)
- World War II: The cargo ship was bombed and sunk at Livorno by American aircraft. (en)
- World War II: The Type VII submarine was depth charged and sunk in the Atlantic Ocean by a Consolidated B-24 Liberator aircraft of 120 Squadron, Royal Air Force with the loss of all 49 crew. (en)
- World War II: The cargo ship was sunk at Olbia, Sardinia, Italy in an Allied air raid. Refloated post-war, repaired and returned to service in 1950. (en)
- World War II: The Type VIIC submarine was damaged in the Atlantic Ocean by a Fido homing torpedo dropped by a Consolidated B-24 Liberator aircraft of 86 Squadron, Royal Air Force. She dived in an effort to evade an attack by but was lost with all 49 crew. (en)
- World War II: The Keishin Maru-class auxiliary gunboat was sunk in the Pacific Ocean about from Shioyazaki, Fukushima prefecture, Japan by with the loss of one crewman. (en)
- World War II: The cargo ship was torpedoed and sunk in the Gulf of Guinea off Takoradi, Gold Coast by . All 41 crew survived. (en)
- World War II: The was sunk off Cape Bon, Tunisia by Allied aircraft. There were no casualties. (en)
- World War II: The cargo ship was torpedoed and sunk in the Adriatic Sea by . (en)
- World War II: The cargo ship was bombed and sunk at Civitavecchia by American aircraft. (en)
- World War II: The Liberty ship was damaged by an Italian limpet mine by Italian Frogmen at Gibraltar. She was beached but declared a constructive total loss. Scrapped in 1951. Two crewmen were killed. (en)
- World War II: The Type 1940 minesweeper was bombed and sunk in the North Sea off Dunkerque, Nord, France by a Handley Page Hampden aircraft of Coastal Command, Royal Air Force. (en)
- World War II: Convoy CD 20: The tanker was torpedoed and sunk in the Indian Ocean by with the loss of three of her 45 crew. Survivors were rescued by . (en)
- World War II: The Soviet schooner was sunk in the Black Sea when holed by a dud torpedo from . (en)
- World War II: The struck a mine and sank in the Pacific Ocean off Kolombangara, Solomon Islands. (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean by with the loss of seven of her 44 crew. One survivor was taken aboard U-198 as a prisoner of war, the rest were rescued by . (en)
- World War II: The minesweeper was torpedoed and sunk in the North Sea off Hook of Holland, South Holland, Netherlands by . 53 crew were killed. (en)
- World War II: Convoy No. 266: The ship was torpedoed and sunk in the East China Sea by . All aboard were killed. (en)
- World War II: She was bombed and sunk south of Cape St. Vincent while on a voyage from Glasgow to Lisbon and Malta with coal and coke. (en)
- World War II: The was sunk in the Pacific Ocean west of Lae New Guinea by and (en)
- The auxiliary minelayer/naval trawler foundered off Adam's Bridge between India and Ceylon. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Mediterranean Sea north west of Ténès, Algeria by with the loss of all 47 crew. (en)
- World War II: The coaster struck a mine and sank in the Smaalandsfarvandet . One of her three crew was killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of nine of her 82 crew. Survivors were rescued by . (en)
- World War II: The Type VIIC submarine was sunk at Kiel, Schleswig-Holstein in an American air raid. Two crew were killed. She was subsequently raised, repaired and returned to service. (en)
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