Hollywood might often showcase submarines hunting down and attacking other submarines in a variety of movies and TV shows, but it’s actually been a very rare event in history.

In fact, the only time a submarine has ever been known for successfully hunting down and destroying an enemy submarine while underwater was in February 1945, with the destruction of the U-864, a German Type IX U-boat off the coast of Norway by a Royal Navy sub.

Towards the end of the war in Europe, U-864 under the command of Ralf-Reimar Wolfram, was sent out on a secret transport mission as part of Operation Caesar to smuggle jet engine components and schematics, bottles of mercury for constructing explosives, advisors, and engineers to Japan undetected by Allied warships prowling around for U-boats.

U-boats
German U-boats outside a Norwegian submarine pen. (Wikimedia Commons)

The faltering German higher command had hoped that even if they were unsuccessful in their theater of war, the Japanese military could benefit from the advanced technology they sent over, continuing the war effort and eventually affording Germany a chance to get back in the fight.