Submarine
- Episode aired Nov 19, 2009
- Not Rated
- 50m
At 171m long, it is the US Navy's largest and can sail for 20 years without refuelling. Uncover the innovations in six landmark submarines that made it possible for the USS Pennsylvania to b... Read allAt 171m long, it is the US Navy's largest and can sail for 20 years without refuelling. Uncover the innovations in six landmark submarines that made it possible for the USS Pennsylvania to be built.At 171m long, it is the US Navy's largest and can sail for 20 years without refuelling. Uncover the innovations in six landmark submarines that made it possible for the USS Pennsylvania to be built.