"The rescue service in northern Norway is coordinating the rescue operation, details have not been not disclosed", the rescue service said in its Twitter blog.
A Russian helicopter with eight people on board went down into the sea on Thursday about two to three km from Barentsburg, a settlement on the Norwegian archipelago of Svalbard in the Arctic Ocean, Norwegian rescue services said. "We don't know if it was a controlled landing", an emergency services spokesman said.
It was on a short flight to Barentsburg from Pyramiden, a disused Russian mining settlement. It's known for its stunning views of snow-covered mountains, fjords and glaciers.
Russian coal company Arktikugol runs the coal mine at Barentsburg, the main activity, which employs Russian and Ukrainian miners.