Most times to visit the Challenger Deep by an individual

Piloting the deep-sea crewed submersible Limiting Factor, retired US Navy officer and explorer Victor Vescovo (USA) has been to the Challenger Deep 15 times between 28 April 2019 and 12 July 2022. The Challenger Deep is the deepest point in the ocean, located at a depth of c. 10,935 m (35,876 ft) at the bottom of the Mariana Trench in the Pacific Ocean, approximately 400 kilometres (250 miles) south-west of Guam.

The data gleaned from Vescovo's (and others') multiple journeys to the Challenger Deep in the Limiting Factor, joined by numerous scientists and oceanographers (including Dr Kathryn Sullivan of NOAA, the first woman to reach the Challenger Deep), along with robotic landers and the scientific support vessel Pressure Drop on the surface, have enabled the topography of the Challenger Deep to be mapped in more detail than ever before. Its greatest-known depth is now calculated to be 10,935 m (35,876 ft), give or take 6 m (95% probability), in its "Eastern Pool".

On his 10th dive on 5 March 2021, accompanied by Hamish Harding (UK), Vescovo spent the longest time traversing the deepest part of the ocean on a single dive (4 hours 15 minutes) and the longest transit at full ocean depth (4.634 km; 2.88 miles).

Vescovo is also the first person to have visited the deepest point in every ocean as part of the Five Deeps Expedition conducted between 19 December 2018 and 24 August 2019; the first person to reach Earth's highest (Mount Everest at 8,848.8 m; 29,031 ft) and lowest points; and the first person to complete the "Explorer's Extreme Trifecta" (summitting Everest, diving to the Challenger Deep and visiting space - i.e., crossing the 100-km-high Kármán Line - as part of the Blue Origin NS-21 mission on 4 June 2022).