ST PETERSBURG (Russia) - SOME of the 20 men killed on a Russian nuclear submarine this weekend may have died because they lacked adequate training in how to respond in a fire drill, a former submarine officer said on Monday.
Russian prosecutors said the victims on board the Nerpa nuclear submarine died from asphyxiation when the fire extinguishing system was set off unexpectedly, releasing toxic freon gas - used as a fire suppressant - into the submarine.