There are extreme sports and then there is cave diving, the most extreme activity a person can engage in without leaving Earth. Cave divers stay underwater swimming miles into – that’s right – caves, where no human has ever been before. It’s pretty cool.
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Selects: Mangroves: Nature's Best Tree?
44:31

How the Kowloon Walled City Worked
41:27

Short Stuff: In-Flight Entertainment
12:23