Last updated: 9 september, 2010 - 16:27 GMT
Luxury submarines 'final spending frontier' for super rich
Many luxury submarine owners prefer to remain anonymous
The luxury submarine market is a nascent but growing industry; there are estimated to be 100 luxury submarines stalking the world's oceans.
Luxury submarines can vary from $1.6 million for a small two to three man craft to $80 million for a four storey tall, 65 metre long undersea goliath.
Bruce Jones is the president and founder of U.S. Submarines, Inc.
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First broadcast 9 September 2010
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