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As investigators tried to determine what activated the firefighting system, Russian naval experts said overcrowding and human errors may have contributed to the accident.
The Nerpa had 208 people aboard when the accident occurred, including 81 seamen, according to the navy. Akula-class subs normally carry a crew of 73.
Retired submarine Capt. Alexander Pokrovsky said in a commentary that sea trials often pose increased safety risks.
"That means cramped conditions, overcrowding and lack of place to sleep," Pokrovsky wrote on the Russian-language Web site http://www.navy.ru/. "Regrettably, all sea trials are like that. Something always happens during trials."
Pokrovsky also criticized Freon-based fire-extinguishing systems, saying they are dangerous for the crew and need to be replaced with safer equipment.
Individual breathing kits should have saved the crew, but some former submariners said civilian shipyard workers usually have little experience in using them. Seventeen of those killed in the accident were civilians, the Russian navy said.
"Civilians were supposed to undergo training, but it usually is pretty informal," said Igor Kurdin, a former captain who heads an association of former submariners. He speculated the fire system could have been triggered by something as simple as someone smoking a cigarette near a safety gauge.
Some commentators also speculated there might not have been enough individual breathing kits for all those aboard during the test.
Since the accident happened in the Sea of Japan, Japan said Monday it was seeking more details from Russia's government about the situation.
[Associated
Press;
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