Kaiko
Kaiko is the remotely controlled Japanese deep-sea submarine that sampled bacteria from the ocean floor of the Challenger Deep in the Mariana Trench, the deepest location in the world. On March 2, 1996, Kaiko reached a depth of 10,897 meters, marking the deepest dive for a submarine on record. Kaiko was lost during a typhoon in May 2003, when a secondary cable connecting it to the surface broke.
