Bathyscaphe Trieste
On 23 January 1960, she reached the ocean floor in the Challenger Deep (the deepest southern part of the Mariana Trench), carrying Jacques Piccard and Don Walsh. This was the first time a vessel, manned or unmanned, had reached the deepest known point of the Earth's oceans. The onboard systems indicated a depth of , although this was revised later to ; fairly recently, more accurate measurements have found Challenger Deep to be between and deep.
Jiaolong (submersible)
Jiaolong ( flood dragon) is a Chinese manned deep-sea research submersible that can dive to a depth of over 7,000 m. It has the second-greatest depth range of any manned research vehicle in the world, the only manned expeditions to have gone deeper were the dives of the Trieste bathyscaphe (10,916m) in 1960, Archimède (9,560 m) in 1962, Deepsea Challenger (10,898m) in 2012 (with all three diving to Challenger Deep) and the Limiting Factor which dove 8,370 meters in December 2018 to the bottom of the Puerto Rico Trench.