Protective paint applied under water.
Various shots of a man spraying paint onto board and he is showered with water. Paint does not wash off, it stays on. Various shots of the paint being prepared and mixed. Various shots of a diver putting oxygen tank and goggles on and entering water tank. He carries paint into water. Various shots of a diver under water painting a post with a brush - it stays painted and paint does not mix with water.
Date found in the old record - 02/11/1967.