An explosion on a submarine which killed two British sailors was caused by an emergency oxygen device, the US military has said.The men died on board the Devonport-based nuclear submarine HMS Tireless during a joint British-US operation under the Arctic icecap.
A third sailor was airlifted to a US military hospital in Anchorage. He is expected to make a full recovery.
A Board of Inquiry has begun into the accident on Wednesday morning.
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