Moon's Pool(1973)

The film that is mostly shot underwater, in a pool, begins with footage of water and a close-up of Nelson from which we move to her body immersed in water in a bath-tub from which yet another transition occurs to a pool with male and female naked bodies swimming underwater. The latter part of the film is almost totally liberated from speech, and has a dreamlike, complex soundtrack consisting of sounds of waves, voices, water and music woven together into a seamless web of sounds.