Hey, don't worry though. The Russian and Norwegian govs have said that it's OK!! :-)

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By Laura Geggel

A Cold War Soviet nuclear submarine met disaster 30 years ago when it sank in the Norwegian Sea, leading to the deaths of 42 sailors. But instead of lying peacefully at the bottom of the sea, that sub, called the Komsomolets, is leaking radioactive material deep beneath the waves.

Several samples collected by an underwater robot from and around the sunken sub's ventilation duct show that it's leaking high levels of cesium, a radioactive element, according to the Norwegian Institute of Marine Research (IMR). Some of the cesium levels are 800,000 times higher than normal levels in the Norwegian Sea, according to the institute.

The Soviets launched the 400-foot-long (120 meters) Komsomolets, which means "member of the Young Communist League," in May 1983, according to the U.S. Central Intelligence Agency. While the Komsomolets was on patrol in April 1989, a fire broke out on board, leading to the sub's eventual demise. As the Komsomolets sank, its two nuclear reactors and at least two torpedoes with plutonium-containing nuclear warheads fell to the bottom of the sea.

Since then, the Russians and Norwegians have monitored the wreck, noting its radioactive leaks.

"We took water samples from inside this particular duct because the Russians had documented leaks here both in the 1990s and more recently in 2007," Hilde Elise Heldal, the expedition leader, said in the IMR statement. "So we weren't surprised to find high levels here."

An analysis showed that one sample had 100 becquerels per liter, compared with the usual 0.001 becquerels per liter normally found in the Norwegian Sea. (A becquerel (Bq) is a unit of radioactivity that represents decay per second.)

But Heldal said it was important to put this number into perspective. For instance, following the Chernobyl nuclear disaster, regulations were set for how much cesium would be allowed in foods. "After the Chernobyl accident in 1986, Norwegian authorities set this limit to 600 Bq/kilogram," she said. So, even though the cesium levels from parts of the submarine "were clearly above what is normal in the oceans," they still "weren't alarmingly high," Heldal said.

Strange cloud

But the remotely operated vehicle (ROV), called the Aegir 6000, did catch a strange sight on film: an eerie cloud emanating from the submarine's duct. After detecting the cloud, the ROV took a sample, which was later found to contain high levels of cesium.

Then, the ROV took another sample from a cloud seen rising from a nearby grille. This reading also had high radioactivity levels.

Now, the researchers are wondering if this "cloud" is related to the high radioactivity levels in those areas. "It looks very dramatic on video, and it's definitely interesting, but we don't really know what we're seeing and why this phenomenon occurs," Gwynn said. "It's something we want to find out more about."