: A significant upgrade over the Type II, featuring four bow tubes and one stern tube. It was the boat used by many of the early war "Aces".
: These late-war iterations maximize range and torpedo storage, with the IXD2 being the largest ocean-going U-boat available to the player. Type XXI: The "Electro-Boat" silent hunter 3 all submarines
: A late-war variant with a stronger pressure hull, allowing it to dive deeper to escape advanced Allied sonar. Type IX: The Long-Range Cruiser : A significant upgrade over the Type II,
