 A pool was set up on stage nine during the production (stage nine is  one of the largest on Tohos lot in Setagaya). They used the pool,  which was about five feet deep, to film the shot of Godzilla rising  above the surface of the ocean. Haruo Nakajima (qv) (the actor in  Godzilla suit) was on a cart on a rail. He held onto the handle of  the cart while it was towed by a truck. As the cart moved forward,  he slowly rose out of the water. He wore a very tiny air cylinder  that contained enough air for about ten minutes. The water that  rushed by his face while the cart was being towed made it very  difficult for him to prevent the mouthpiece from coming out of his  mouth.