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"It's heavily colonised by penguins and elephant seals and all kinds of sea birds," said Prof Coffin, who studies the undersea geography of the islands.

This January, the British defense secretary, John Healey, accused Russian ships of spying on the location of undersea communication and utility cables that connect Britain to the rest of the world.

Its navy has been trying to prevent sabotage of undersea cables.

A series of undersea cables and gas pipelines have been damaged in suspected attacks since Russia's invasion of Ukraine, prompting Nato to launch a monitoring mission in the sea.

Western nations have often tracked Yantar operating in European waters and they suspect part of its mission has been to map undersea cables.