Fourteen submariners on board a Russian Defense Ministry research vessel were killed in a fire while carrying out a survey of the sea floor off Russia’s Arctic coast, the ministry was quoted as saying by Russian news agencies.

The incident took place on the AS-12 deep-sea nuclear submarine nicknamed Losharik, an unnamed source in the security forces told the RBC news website. Launched in 2003, Losharik was designed for research, rescue and special military operations and can hold up to 25 crew members.