- U-boat is the same as submarine, German for unterseeboot
- nuclear-powered submarines are capable of remaining underwater for months at a time
- going down in a submarine for a deep-sea mission
- The Turtle, a one-man craft invented by David Bushnell, a student at Yale, was built of wood in the shape of a walnut standing on end - designed for attacking British warships in the American Revolution
- In the long course of history, having people who understand your thoughts is much greater security than another submarine. (J. Wm. Fulbright)
- O God, thy sea is so great, and my boat is so small. (prayer of Breton fishermen)
- The Museum of Science and Industry invites you to step inside the real U-505 - the only German submarine in the United States, and, now, a national memorial to the 55,000 American sailors who gave their lives on the high seas in WWI and WWII.
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