HMS Venturer is identified as the submarine that sank another submarine while both were submerged. Its target was a German boat carrying material toward Japan. The captain is credited with calculating the attack despite a torpedo computer that was not set up for an underwater interception. The firing pattern is recalled as four torpedoes spread vertically to cover depth, rather than the usual horizontal spread. The account also credits a lieutenant and two chiefs with helping adjust the torpedoes manually while the target remained a potential threat.
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HMS Venturer's submerged torpedo interception
Venturer's attack required an underwater firing solution and a depth-spread torpedo pattern beyond the normal fire-control setup.