A senior lieutenant serving on the Gepard atomic submarine, part of the Northern Fleet, hanged himself in his cabin, Northern Fleet Investigative Committee spokesperson Alexander Kuratov said Monday, RIA-Novosti reported.

Maxim Galkin was found dead by his cabin mate late Saturday. No suicide note was found by investigators, Kuratov said.

Last month, the Gepard submarine caught fire during a technical inspection while stationed at the Northern Fleet's submarine headquarters in the Murmansk region. No one was injured in the incident.