Learn how one veterinarian at the Charuami aquarium on the Japanese Island of Okinawa has developed a whole new kind of underwater medicine to look after the manta rays in this segment from Operation Wild. He has devised the world's only underwater ultrasound machine, which means he can closely monitor pregnant manta rays and ensure the safe arrival of their babies. His work has uncovered previously unknown information about this elusive species, which should help efforts to conserve them in the wild.