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.
Alexey Molchanov
Alexey Molchanov is the deepest man in the history of the competitive freediving. He achieved his first world record in 2008 in a pool discipline called Dynamic Apnea, in which he swam 250m underwater with a monofin on one breath. Since then he focused on the depth discipline and began to compete in the open ocean.