A series of underwater adventures.
The Caribbean. Divers Martha Holmes and Mike deGruy, wearingspecially developed helmets which allow them to talk underwater, are mobbed by giant sting-rays, and when Martha journeys in a submarine she encounters some even stranger creatures.
Back on the boat a hydrophone lures sharks, and the temptation to join them in the water proves irresistible. Nearby, 100 dolphins frolic, and Mike and Martha try to keep them entertained.
Producer Robin Hellier