World champion freediver Tanya Streeter plunges into the greatest whale-watching spectacle on the planet. For only a few weeks each year, humpbacks migrate to a remote corner of the Caribbean to flirt, fight and give birth. Tanya can hold her breath for over six minutes, but diving with whales is not without its risks. Rutting males are very protective of young mothers, so will Tanya be able to fulfil her dream and be accepted into the whales' world?