While the Type XXI subs sank no ships, their potential terrified Allied navies, prompting intensified anti-submarine efforts. Although they lost World War II, the Nazis were more technologically ...

Designed as a hunter-killer (HK) submarine, the Tullibee’s primary mission was to detect and destroy enemy submarines. At the time, Navy doctrine still held the HK and attack missions separate, with ...

Although they lost World War II, the Nazis were more technologically advanced than their Allied rivals in multiple ways. Berlin’s problem was scale—and trying to do too much with too few resources.