Missing British billionaire Hamish Harding has a Guinness world record for the longest duration spent at the bottom of the sea.The London-born adventurer set it in 2021 after diving in a submersible to the deepest place on Earth, the Mariana Trench, and traversing it for four hours 15 minutes.It was one of three world records the 58-year-old has earned. He set another one for the longest distance – three miles – covered at the bottom of the ocean. His first was set in 2019, for the fastest circumnavigation of the Earth via North and South Poles in a Gulfstream 650ER business jet. And last year he went into space.
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