On January 8th, 2005, Australian diver David Shaw attempted to retrieve the body of Deon Dreyer, who had died in Bushman's Hole, an 886-foot-deep cave in South Africa in 1994. Shaw ultimately reached the body, but became entangled and died on the cave floor, leaving his friend and support diver, Don Shirely, to fight for survival.

Sources:

The Guardian: Deepest Sympathy

Dave Shaw final dive video

Dave Not Coming Back | FULL DOCUMENTARY

VIDEO: To Boldly Go | David Shaw

The Aftermath Of Love: Don Shirley and Dave Shaw

Death in the depths: the divers willing to pay the price of taking sport to extremes

Raising the Dead