Sergey Anatolievich Preminin (Russian: Сергей Анатольевич Преминин; 18 October 1965 – 3 October 1986) was a Soviet Russian sailor who, after an explosion aboard nuclear submarine K-219, prevented an impending nuclear meltdown by manually forcing damaged control rods into place.

Preminin was born on 18 October 1965 in the village of Skornyakovo in Vologda Oblast,[1] then in the Russian SFSR of the Soviet Union.

[2] On 3 October 1986, while on patrol 680 miles (1,090 km) northeast of Bermuda, the K-219 suffered an explosion and fire in missile compartment VI.

After further attempts from other colleagues to force open the hatch from outside, Preminin died in the hot reactor chamber, as the rest of the crew had to move further towards the rear to escape the poisonous gases that spread out in the boat.

The sinking of the submarine and Preminin's feat were the subject for the book Hostile Waters, written by Peter Huchthausen, Igor Kurdin and R. Alan White.

The BBC produced a television film of the same name in the same year, under the direction of David Drury of Warner Bros.