Hitler's 'Wonder' U-Boats

Launched during the last days of the Third Reich in an attempt to restart the Battle of the Atlantic, the majority of these revolutionary Electro-U-boats never saw action. Instead they became the forebears of the Cold War’s much dreaded hunter killer submarines.

The massive Type XXI was planned to replace the conventional ‘Atlantic’ U-boat that had seen service so far in the war. The Type XXIII was...