Accident on Russian nuclear sub suffocates 20

The fire safety system on a brand-new Russian nuclear submarine accidentally turned on as the sub was being tested in the Sea of Japan, spewing a gas that suffocated 20 people and sent 21 others to the hospital, officials said Sunday.

Russian Navy said the submarine itself was not damaged in Saturday's accident and returned to its base on Russia's Pacific coast under its own power Sunday. The accident also did not pose any radiation danger, the navy said. The submarine being tested had 208 people aboard, including 81 seamen, according to Russian navy spokesman Capt. Igor Dygalo. Yet Russian news agencies said a sub of this type normally carries only a crew of 73. Russia's worst naval accident since torpedo explosions sank another nuclear-powered submarine, the Kursk, in the Barents Sea in 2000, killing all 118 seamen aboard.

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Russian submarine accident