Robotic submarines

tethered underwater mobile device operated by a remote crew

untethered submersible manned or unmenned

type of autonomous underwater vehicle that uses small changes in its buoyancy to move up and down and uses wings to convert the vertiical motion to horizontal, propelling itself forward with very low power consumption

autonomous underwater vehicle under development by Boeing and Huntington Ingalls Industries

thumb|Cryobot prototype thumb|Artist's impression of a cryobot deploying a AUV|hydrobot thumb|Prototype IceMole, a further development

autonomous underwater vehicle built by Boeing

The Bluefin-21 is an autonomous underwater vehicle (AUV) developed by Bluefin Robotics for defence, commercial or scientific use. It found its most famous use in April 2014 in the search for the wreckage of the missing Malaysia Airlines Flight 370.

class of submersible remotely operated vehicle, including the Scorpio II and Super Scorpio operated by the US and UK navies