Bill Stone Explores the World's Deepest Caves
Bill Stone

Bill Stone talks about space exploration using cave exploration machines and ingenious methods for fuel and propulsion.

1 people like this

Bill Stone: Bill Stone Explores the World's Deepest Caves

March 1, 2007 (over 13 years ago)

Bill Stone talks about space exploration using cave exploration machines and ingenious methods for fuel and propulsion.

1 people like this
Source: TED

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