Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Trip to Check Radiation after 1989 Sinking of Russian Sub Associated Press 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. .