(1) Buy a cheap 8' x 10' metal shed kit from Sears. (2) Assemble the shed. (3) Use bathroom caulking to make the shed water-tight for extended, deep-ocean dives. (4) Bolt a submarine-approved, nuclear-powered motor to the bottom of the shed. (5) Outfit the shed with modern submarine equipment acquired from a U.S. Navy auction. (6) Hire an experienced submarine crew.