Longest distance traversed at full ocean depth by a crewed vessel
Hamish Harding, Victor Vescovo
4.634 kilometre(s)
Not Applicable ()

The farthest distance travelled along the deepest part of the ocean is 4.634 km (2.88 miles) by Hamish Harding (UK) and Victor Vescovo (USA), who traversed the sea floor of Challenger Deep in the Mariana Trench during a 4-hour 15-minute dive in the Deep-Submergence Vehicle (DSV) Limiting Factor on 5 March 2021.

Challenger Deep is located about 300 km (186 mi) south-west of Guam in the western Pacific Ocean and is the deepest point in the ocean, with a depth in its "Eastern Pool" of c. 10,930 m (35,860 ft).

Harding's dive with Vescovo (who built the DSV Limiting Factor) was the longest in terms of both the distance covered at "full ocean depth" and the time spent at the bottom.