Daring Game (1968)

Survival Devices, Inc are an organisation that employ a team of adventurers known as "the Flying Fish" who are adept in sky diving, scuba diving and martial arts. They are engaged to rescue a captured scientist imprisoned on a Caribbean island by a dictator.
The team parachutes off the coast of the island in a HALO jump and establishes an inflatable underwater basecamp in an "Instant Underwater Habitat" or "Igloo".