COPENHAGEN - Norwegian researchers say they found a leak from a Soviet nuclear submarine that sank 30 years ago, but it poses no risk to people or fish.

Hilde Elise Heldal of the Norwegian Institute of Marine Research says levels "weren't alarmingly high."

The institute said Thursday that findings were around 100 Becquerel (Bq) per litre (0.26 gallon) as opposed to around 0.001 Bq per litre elsewhere in the Norwegian Sea.

The joint Norwegian-Russian expedition set off Saturday from Tromsoe, northern Norway, to the Arctic Barents Sea where the Komsomolets submarine sank at about 1,700 metres (5,610 feet) in 1989. Forty-two of the 69 crewmen died in a fire. The mission arrived on location Sunday.