About: Ascending and descending (diving)

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In underwater diving, ascending and descending is done using strict protocols to avoid problems caused by the changes in ambient pressure and the hazards of obstacles near the surface such as collision with vessels. Diver certification and accreditation organisations place importance on these protocols early in their diver training programmes. Ascent and descent are historically the times when divers are injured most often when failing to follow appropriate procedure.

Attributes	Values
rdf:type	Thing
rdfs:label	Ascending and descending (diving) (en)
rdfs:comment	In underwater diving, ascending and descending is done using strict protocols to avoid problems caused by the changes in ambient pressure and the hazards of obstacles near the surface such as collision with vessels. Diver certification and accreditation organisations place importance on these protocols early in their diver training programmes. Ascent and descent are historically the times when divers are injured most often when failing to follow appropriate procedure. (en)
rdfs:seeAlso	Saturation diving Freediving
foaf:depiction
dcterms:subject	Diving decompression Underwater diving procedures
Wikipage page ID	25727551 (xsd:integer)
Wikipage revision ID	1118082765 (xsd:integer)
Link from a Wikipage to another Wikipage	Saturation diving Moon pool Barotrauma Decompression sickness John Scott Haldane List of diver certification organizations Underwater Demolition Team Underwater diving Ear clearing Controlled emergency swimming ascent Ancient Greece Glossary of underwater diving terminology: D–G Glossary of underwater diving terminology: T–Z Surface-supplied diving Leonard Hill (physiologist) Pony bottle Buddy diving Dive computer Diver training Diving equipment Diving support vessel Ambient pressure Diving decompression Glossary of underwater diving terminology Delayed surface marker buoy Underwater habitat Heliox Bottom time High-pressure nervous syndrome Winch Diver communications Diving bell Diving disorders Underwater diving procedures Buoyancy Buoyancy compensator (diving) Bühlmann decompression algorithm Freediving Pulmonary barotrauma Scuba diving Robert Davis (inventor) Safety stop Exhalation Fitness to dive Marine vessel Dry-suit Diving weights Shot-line Scuba regulator Standard diving equipment dbr:Groupe_d'Etudes_et_de_Recherches_Sous-Marines_de_la_Marine_Nationale
sameAs	Ascending and descending (diving) Ascending and descending (diving) Ascending and descending (diving)
dbp:wikiPageUsesTemplate	dbt:Annotated_link dbt:Cn dbt:Convert dbt:Main dbt:Reflist dbt:See_also dbt:Short_description dbt:Underwater_diving
thumbnail	wiki-commons:Special:FilePath/USNS-Grasp-Diver-On-Stage.jpg?width=300
has abstract	In underwater diving, ascending and descending is done using strict protocols to avoid problems caused by the changes in ambient pressure and the hazards of obstacles near the surface such as collision with vessels. Diver certification and accreditation organisations place importance on these protocols early in their diver training programmes. Ascent and descent are historically the times when divers are injured most often when failing to follow appropriate procedure. The procedures vary depending on whether the diver is using scuba or surface supplied equipment. Scuba divers control their own descent and ascent rate, while surface supplied divers may control their own ascents and descents, or be lowered and lifted by the surface team, either by their umbilical, or on a diving stage, or in a diving bell. Descent rates are usually limited by equalisation issues, particularly with ears and sinuses, but on helmet dives can be limited by flow rate of gas available for equalising the helmet and suit, by carbon dioxide buildup caused by inadequate exhalation, and for divers breathing heliox at great depths, by high-pressure nervous syndrome. Ascents of divers breathing at ambient pressure are normally limited by decompression risk, but also to a far lesser extent, by lung overpressure injury risk. Historically there has been considerable change in the recommended maximum ascent rate, mostly to limit risk of decompression sickness. Freedivers are less limited by equipment, and in extreme events may use heavy ballast to accelerate descent, and an inflatable lift bag to accelerate ascent, as they do not normally stay under pressure long enough to be affected by decompression issues. Atmospheric pressure suit divers are physiologically unaffected by the external pressure. Their rates of ascent and descent are limited by equipment deployment and recovery factors. (en)
gold:hypernym	Protocols
prov:wasDerivedFrom	wikipedia-en:Ascending_and_descending_(diving)?oldid=1118082765&ns=0
page length (characters) of wiki page	36004 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Ascending_and_descending_(diving)
is Link from a Wikipage to another Wikipage of	Downline (diving) Glossary of underwater diving terminology: A–C Ascent and descent (diving) Haldane's decompression model Dive boat Dive leader Diving procedures

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