During World War II, German U-boats wrought havoc upon Allied supply lines and commercial shipping inflicting heavy losses on merchant convoys. Lurking stealthy beneath the waves, these deadly submarines operated with great secrecy and surprise, attacking merchant vessels and warships using torpedoes and, at times, surface guns, resulting in considerable economic and military losses for the Allies.
By the end of the war, German U-boats had sunk almost 3,000 Allied ships. In response, Allied submarines and warships managed to sink approximately 785 of these U-boats. Remarkably, only one of these kills were made when both submarines were submerged.
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HMS Venturer. The only submarine in history to have sunk another while both were submerged.
Source: amusingplanet.com