"There were many outsiders on board to conduct all the tests. As a rule, these people do not know how to behave on board the submarine. They only know how to fix a device which they made at their enterprises. No one of them has ever been to a submarine before, but they want to find themselves there, because it is a financially profitable initiative. It is not ruled out that it was them who caused the state of emergency," experts say. "Contractors drink a lot during tests, they do it all the time. Someone could simply light up a cigarette in a compartment," he added

8 November: 20 dead and 22 injured in accident on Russian nuclear submarine in the Pacific Ocean. The accident occurred during the non-sanctioned activation of the firefighting system. The nuclear reactor was unaffected.

Russia's navy says the nuclear-powered submarine involved in an accident in the Sea of Japan that killed at least 20 people has returned to its base. An accident aboard a Russian nuclear-powered submarine making a test run in the Sea of Japan killed at least 20 people