The First and Only Submarine Dogfight

A Rare Encounter in the Cold Depths

On February 9, 1945, a unique naval engagement took place beneath the cold waters of the Atlantic Ocean. The British submarine HMS Venturer was patrolling off the coast of Norway when it detected a German U-boat, U-864, on its radar. What followed was the first—and only—underwater submarine battle in history.

Calculating the Unseen

HMS Venturer, under the command of Lieutenant James Launders, tracked U-864’s movements and prepared for a complex engagement. The German U-boat, captained by Ralf-Reimar Wolfram, was carrying a secret cargo of aircraft parts, mercury, and technicians to Japan. Both submarines remained submerged, neither surfacing for a clearer shot.

The Submerged Duel

Lieutenant Launders meticulously calculated a firing solution, anticipating U-864’s movements in three dimensions. At 12:12 pm, HMS Venturer launched four torpedoes in a fan pattern. U-864, realizing the danger, began evasive maneuvers, but it was too late. One of Venturer’s torpedoes struck U-864, sinking it with all 73 crew members.

A Singular Moment in Naval Warfare

This unique encounter remains the only recorded instance of one submarine sinking another while both were submerged, marking an extraordinary moment in naval history.

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