Story: Captain Barnacles and his intrepid band of explorers roam the oceans in search of adventure and fun. When a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down. br br The Octonauts is a British children's television series, produced by Silvergate Media for the BBC channel Cbeebies. The series is animated in Ireland by Brown Bag Films but uses British voice actors. The TV series is based on American-Canadian children's books written by Vicki Wong and Michael C. Murphy of Meomi Design Inc.