Mayflower AI sea drone, or Mayflower Autonomous Ship, or Mayflower 400 (MAS400) is an autonomous research vessel that aims to cross the Atlantic without human crew or assistance. It is named after the Mayflower sailing ship, that carried English and Dutch Pilgrims onboard from England to New England between September and November 1620. Taking the same route, it was originally intended to set sail in September 2020 in time for the 400th anniversary. The ship will sample the water for pollutants and study marine life during its voyage. It will also trial its computer systems.