Blue Reef Adventures: Dive to the Extreme: The World's Deepest Scuba Dive (1998)

In the grassy highlands of South Africa lies one of the deepest freshwater caves in the world. Nearly 1,000 feet deep, one man has spent 15 years exploring its black waters. Now, he attempts to do what no one has ever done before: scuba dive to the bottom – deeper than any man have ever gone before and survived.