Nereus
Autonomous underwater vehicle
>
&h=824&w=806&tbnid=GgLOgLHsEXF1HM&q=Nereus+(underwater+vehicle)&tbnh=227&tbnw=222&usg=AI4_-kQ4Y7WXEXReH7F57ks-wlTJcj5Nsg&vet=1&docid=qIEoRH1Yh_Z7aM&itg=1&sa=X&ved=2ahUKEwis_8Him86FAxUTk4kEHSf0CY4Q9QF6BAgAEAQ)
&tbnh=96&tbnw=141&usg=AI4_-kQfETtACLoZIHFItYlo-Abkk2xhlA&vet=1&docid=5VxJCR9PL9adzM&sa=X&ved=2ahUKEwis_8Him86FAxUTk4kEHSf0CY4Q9QF6BAgAEAY)
&tbnh=98&tbnw=131&usg=AI4_-kRHEsaEelLZ2QnD_6oyPV04b2suUw&vet=1&docid=9S2g1erdew3FKM&sa=X&ved=2ahUKEwis_8Him86FAxUTk4kEHSf0CY4Q9QF6BAgAEAg)
&tbnh=94&tbnw=150&usg=AI4_-kTj2uEPbCs2qeJkhdXJIv342zv0Pg&vet=1&docid=Xf0HX5OSbQylPM&sa=X&ved=2ahUKEwis_8Him86FAxUTk4kEHSf0CY4Q9QF6BAgAEAo)
Nereus was a hybrid uncrewed autonomous underwater vehicle built by the Woods Hole Oceanographic Institution. Constructed as a research vehicle to operate at depths of up to 11,000 metres, it was designed to explore Challenger Deep, the deepest... Wikipedia
Length: 3 metres (9.8 ft)
Fate: Imploded due to high pressure in Kermadec Trench 10 May 2014
In service: 2009~2014
Sensors and processing systems: side-scan sonar & LED search lights
Speed: 3 knots