In late 1944 they were planning two variants ("type XXI B" and "XXI C"). The first variation forsaw another six torpedo tubes to the bow, but aiming aft down the side of the sub, 3 per side. In the second variation the number of torpedo tubes increase to 18 tubes (six to launch forward, twelve to launch aft, 6 per side). In both variations the Flack Guns were upgraded to 37mm and the maximum length of the boat was 83 meters long.
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