It is possible, indeed it did happen: Brit sub HMS Venturer sank U-864 on 9 February 1945 while both were submerged after a 3-4 hour engagement. That does not mean it was common. In fact, this case is the only known instance in naval warfare history where one submerged submarine sank another submerged submarine.
Last edited by fatty; 12-03-08 at 11:18 PM.
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