Norway has found a radiation level 800,000 times higher than normal at the wreck of a Russian navy submarine.
The Komsomolets sank in the Norwegian Sea in 1989 after a fire on board killed 42 sailors.
A sample showed radioactive caesium leaking from a ventilation pipe, but researchers said it was “not alarming”, as the Arctic water quickly diluted it.
The Soviet-era sub is also deep down, at 1,680m (5,512ft), and there are few fish in the area, they added.
For the first time a Norwegian remotely-operated vehicle (ROV) examined and filmed the Komsomolets on 7 July, revealing severe damage.
The submarine is also known as K-278 in Russia, and it sank carrying two nuclear torpedoes with plutonium warheads.
Its front section has six torpedo tubes, and the sub could also launch Granit cruise missiles.
