On this day, 39 years ago, on October 3, 1986 (August 30, 1986 in the lunar calendar), a nuclear submarine in the Soviet Union caught fire and sank. On October 3, 1986, a compartment of a Soviet nuclear submarine equipped with ballistic missiles caught fire about 1,000 kilometers northeast of Bermuda, killing three people on board the submarine in the fire. Based on an analysis of the situation, the expert committee in Moscow believes that there will be no danger of nuclear explosion and radioactive contamination of the environment due to fire. On October 6, the Soviet Yanki-class nuclear-powered submarine that failed and caught fire sank in the eastern United States. It is reported that the submarine can carry 16 missiles and has a maximum cruising range of 1,800 nautical miles. The United States believes that the nuclear submarine is one of the three main nuclear submarines of the Soviet Union cruising in the mid-Atlantic, and its missiles are mainly targeted at military facilities in the eastern United States.