Ideas worth spreading

Inside the world's deepest caves

2,261,551 views | Bill Stone • TED2007

Bill Stone, a maverick cave explorer who has plumbed Earth's deepest abysses, discusses his efforts to mine lunar ice for space fuel and to build an autonomous robot for studying Jupiter's moon Europa.

Bill Stone, a maverick cave explorer who has plumbed Earth's deepest abysses, discusses his efforts to mine lunar ice for space fuel and to build an autonomous robot for studying Jupiter's moon Europa.

This talk was presented at an official TED conference. TED's editors chose to feature it for you.

About the speaker

Bill Stone

Explorer, inventor, outer space dreamer

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Engineer and daredevil cave explorer Bill Stone is obsessed with discovery -- on Earth and beyond.

This talk was presented at an official TED conference. TED's editors chose to feature it for you.