Austrian Herbert Nitsch is the current freediving world record holder and is a.k.a. "the deepest man on earth" (253.2m / 830.8ft) and the only freediver with 33 World Records across all freediving disciplines.
A part time pilot, Nitsch cemented his status as the Deepest Man on Earth in 2007 with a new world record. No one has yet surpassed 253meters, but there is no doubt that daring souls will continue to descend into the depths of the ocean, and the record won't stand for long. For an idea of what that will take, watch Nitsch set the current record