Several weeks ago we told you about the beloved beluga whale Hvaldimir who was found dead. Animal rights groups claim it was shot but a forensic examination has since concluded that “human activity” did not directly lead to the death of the animal. Hvaldimir rose to fame following rumours that he had been trained as a “spy” by Russia. But another story needs to be told: How he helped scientists decipher the language of whales. We speak to the people behind the upcoming documentary "#hvaldimir: the true story of the spy whale”.