Ricou Browning

Ricou Ren Browning was an American stunt performer, filmmaker and actor. A skilled swimmer, he was known for his innovative underwater stunt work, notably in the 1954 film Creature from the Black Lagoon, in which he portrayed the titular Gill-man during the film's underwater scenes, and in the 1965 James Bond film Thunderball, for which he was the underwater sequences director. He was also the co-creator of the Flipper media franchise.

— Source: Wikipedia (CC-BY-SA).