Nuclear sub blaze over but crew still on board

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The Russian navy suffered its worst accident in August 2000, when the Kursk nuclear submarine exploded and sank during naval manoeuvres, killing all 118 crew members aboard.

A 2008 accident at the Nerpa nuclear-powered submarine killed 20 Russian seamen and injured 21 others when its fire-extinguishing system activated in error and spewed suffocating gas.

The Yekaterinburg is a Delta-IV-class nuclear-powered submarine that normally carries 16 nuclear-tipped intercontinental ballistic missiles. The 166-metre (548-ft) vessel hasa displacement of 18,200 tons when submerged.