They stalked Allied ships in silence, deadly and unseen. Then, one by one, they were destroyed — sent to the ocean floor by torpedoes, depth charges, and the tides of war. But some didn’t stay lost.

The post-war narrative of the German U-boat efforts follows several stages: the first “Happy Time,” followed by the second “Happy Time,” and then utter destruction by the Allies. In reality, the ...

February 1943. In the icy North Atlantic, German U-boats encircled Convoy ON-166, 63 ships hauling vital cargo from America to Britain. What should’ve been an easy slaughter turned into a nightmare.