On 7 April 1989, the most advanced submarine the Soviet Union ever built caught fire in the Norwegian Sea. The crew contained it. They surfaced. They radioed for help. And then the ship sank anyway — taking two nuclear torpedoes to the bottom of the ocean, where they remain today, decaying at 1,686 meters depth.

This is the full story of K-278 Komsomolets. The submarine that dove deeper than any vessel in history. The rescue capsule that was never properly tested. The valve seats that were never replaced. The rescue ships that never came. And the nuclear warheads that no government has yet committed to recovering.

The Bellona Foundation's 2019 expedition found Cesium-137 concentrations at the wreck site eight hundred thousand times above background levels. The classified maintenance files that explain exactly how this disaster was preventable remain sealed in a Moscow archive.

27 men survived. 42 did not. The depth record set on 4 August 1985 still stands.


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