"Wolfpacks," teams of German U-boats that attack at night, are sinking convoys of allied ships along with Britain's hopes of ever controlling the Atlantic. However, the development of radar allows escort warships to lock in on U-boats ten miles away. This new technology, plus the lucky discovery of German codebooks and equipment, gives Britain the upper hand, but the triumph is short-lived. Hitler orders the mass production of U-boats and the carnage continues. Britain needs America's help, and thanks to the Japanese, their wish comes true.

It's 1943 and German U-boats continue to decimate allied shipping. The allies must find a way to defeat Admiral Karl Donitz's "wolfpack" or they will lose the war. The stakes have never been higher, the battles have never been larger and the casualties have never been higher. By the time World War II ends, no other branch of the armed forces will suffer as a high a mortality rate. Hear the stories from the German and allied soldiers, who still carry with them the haunting memories of the Battle of the Atlantic.