The mystery as to why a beluga whale appeared off the coast of Norway wearing a harness may finally have been solved.
The tame white whale made headlines five years ago amidst widespread speculation that it was a Russian spy, which experts now believe belonged to the military.
One expert in the species says she believes the whale did escape from a naval base in the Arctic Circle, however Dr Olga Shpak does not believe it was a spy.
A BBC documentary, Secrets of the Spy Whale, looks into how the whale escaped and is now on BBC iPlayer and will be shown on BBC Two on Wednesday at 21:00 GMT in the UK.
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