Film director James Cameron made a solo descent to Challenger Deep in 2012.
Notes on verification
Confirmed by multiple independent, authoritative sources including Guinness World Records, WHOI, and NBC News, with consistent details on the solo dive and year.
Sources
- The Pacific Ocean—facts and information (nationalgeographic.com)
- https://www.guinnessworldrecords.com/world-records/613583-first-dive-to-the-challenger-deep-by-a-crewed-vessel-solo (guinnessworldrecords.com)
- https://www.whoi.edu/what-we-do/explore/underwater-vehicles/deepseachallenger/ (whoi.edu)
- https://www.nbcnews.com/id/46850002/ns/technology_and_science-science (nbcnews.com)