The film highlights the faulty Mark 13 aerial torpedo used by the US Devestator at the time. Even before the war, the Mark 13 was shown to be faulty with most test torpedoes either sinking, running on the surface, or just failing to launch. Studies later found that many torpedoes were damaged upon impact with the water, namely the propellers and the torpedo head. It took two years of testing and re-evaluation before the Mark 13 became a reliable weapon by incorporating a shroud to protect the propeller fins and adding a drag ring to the torpedo head to cushion the impact. The drag ring was made of wood and would break away upon impact. During Midway, only a single Mark 13 found its target and detonated. It was dropped by a Catalina float-plane and hit the oil-tanker Kiyosumi Maru. The explosion ripped a 33 foot hole in the ship's bow but the Kiyosumi Maru survived and continued on with its mission.

Film

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