March 25, 2012 Explorer/Filmaker James Cameron descended into the Marianas Trench to a depth of 35,776 feet (6.77 miles)..the deepest ever dive in a solo sub. The descent took 2 hours 36 minutes and the ascent took about 70 minutes. In 2009 the Marianas Trench was established as a United States National Monument. I think the isolation and the unknown would be way too much to bear. Claustrophibia seems inescapable. Would you ever do something like that if you could?