In this video image from Ru-RTR Russian state television channel, firefighters spray water on the Yekaterinburg nuclear submarine in a dock at the Roslyakovo shipyard in the Murmansk region, Russia. A fire that erupted while the Yekaterinburg was in
In this video image from Ru-RTR Russian state television channel, firefighters spray water on the Yekaterinburg nuclear submarine in a dock at the Roslyakovo shipyard in the Murmansk region, Russia. A fire that erupted while the Yekaterinburg was in

COPENHAGEN, DENMARK - Norwegian authorities say a joint Norwegian-Russian expedition will assess whether a Russian submarine that sank 30 years ago is leaking radioactive material.

The Radiation and Nuclear Safety Authority say a Norwegian research vessel will set off Saturday from Tromsoe, northern Norway, to the Arctic Barents Sea where the Komsomolets submarine sank in 1989.
 
Forty-two of its 69 crewmen died in a fire, and the submarine's nuclear reactor and two nuclear warheads are still on board.

The agency said Friday that a remote-controlled submersible would be used and the work ``would be demanding'' as ``lies deep'' at about 1,700 meters (5,610 feet)  
 
Norway has found elevated concentrations of the radioactive substance cesium-137 around the wreck but said the levels were barely detectable and presented no danger.