Out of the 118 Type XXI submarines built by Nazi Germany during the war, only two were deployed before WWII ended because of disregard for quality control, the paper reported. The design was later ...

Submarines during World War II were used mainly for defending friendly coastlines, harassing enemy warships and interdicting enemy convoys. The Type XXI was meant to carry out these same missions ...

"The Type XXI was the first genuine submarine that could sail submerged for a prolonged time, and the U-3523 had a range that would have allowed it to sail non-stop all the way to South America." ...

On May 4, 1945 one of the most advanced submarines in the world crept up to a British Royal Navy cruiser. U-2511 was one of Germany’s new Type XXI-class “wonder” submarines, and she was ...