In their second film, divers Martha Holmes and Mike de Gruy sample the Caribbean, where they enjoy close and loving encounters with the sea creatures in the waters around the Cayman Islands and the Bahamas. Paradise, perhaps, but there's a sting in the tail when they are mobbed by a squadron of giant sting-rays, who administer love-bites on their legs. But friendly schools of dolphins are happy to play, though only when the divers substitute snorkels for their bubble helmets, whose weight acted as a brake on the underwater frolics. Until the humans can match them dive for dive, the lively dolphins find them rather boring.