First evidence of underwater vocalisations in King Penguins

Video recorded from a camera attached to the back of a King penguin. It recorded the behaviour of the penguin when foraging at sea. The video shows a full dive, starting with the penguin on the sea surface, then duck-diving, feeding underwater (series of 17 capture attempts between 2:05 and 3:20), then the penguin finally starts its ascent until it comes back to the sea surface. Underwater vocalisations were recorded before prey captures at 2:30, 3:02 and 3:03.