Four boats from the conflict remain as museum ships -- the U-505, U-534, U-995, and the U-2540. The U-505 resides at the Chicago Museum of Science and Industry .

Germany first started testing submarines in 1851, and by the end of WWI, had built some 334 U-boats (with another 226 under construction). They were vastly superior to U.S. subs.

Four boats from the conflict remain as museum ships – the U-505, U-534, U-995, and the U-2540. The U-505 resides at the Chicago Museum of Science and Industry .