Specs: Propelled by a nuclear reactor, the USS Ohio can reach speeds of 30 mph, dive 800 feet, and support operations of 66 personnel for up to 90 days.

Military use: The first Trident sub-- it was OK'd as a nuclear missle-launch sub in 2001-- the Ohio was refitted to ballistic missile status in 2005, and is now capable of firing 154 conventional cruise missiles.