Soviet submarine K-11


K-11 was a Soviet November-class nuclear-powered attack submarine that had two reactor accidents during loading of the nuclear reactor core in Severodvinsk on 7 and 12 February 1965. Reasons for the accidents included nonobservance of operating instructions by those participating in the lift of the reactor cover and the mistaken decision to continue refueling after the first accident. There were no fatalities but those accidents caused an unsafe release of radiation into the environment and nearby shipyard area. Seven men were treated for exposure to radiation. The reactor compartment holding the two damaged reactors was removed, partially decontaminated and sunk in Abrosimov Bay in the Kara Sea in 1966. A new reactor compartment was installed and the submarine continued to perform her duties from August 1968 until decommissioning on 19 April 1990. K-11 passed the milestone of 220,179 miles traveled in 1988. The submarine has been laid up in Gremikha Bay since of 2000.