On 23 January 1960, Don Walsh and Jacques Piccard were the first men to descend to the bottom of the Challenger Deep in the Trieste bathyscaphe.
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In October 1999, Kaikō performed a robotic mechanical operation at a depth of 2,150 meters off the coast of Okinawa near the Ryukyu Trench, connecting measuring equipment with underwater cables on the sea floor.
The archives are next to Kaiko Hiroba (Port Opening Square) where Commodore Perry landed to sign the Convention of Kanagawa.