Above the set, however, is a piece of rippled glass to simulate the surface of the water. To accomplish the bubble effect, an air line was run along an interior wall of the thin fish tank with its aperture positioned so that in the camera's line of sight it appeared to be on the right side of the Ocean Door. Once the air line was positioned properly, the glass around it was painted to match the 'rock' face and hide the air line. The red line drawn across this screen shot shows the border between the painted glass and the actual miniature set. Another dry filmed sequence.
Stingray is hit by a missile and falls to the ocean floor.
At the same time as the model hit the floor, a cloud of bubbles was released from the bottom of the fish tank positioned between the camera and the set. Also at the same time, a blast of air was directed through a tube loaded with Fuller's Earth, a very fine powder, to create a cloud of dust to simulate silt thrown up from the sea bed at the impact point. As you can see, a scene like this required a great deal of coordination between several people. The Marineville Base set was actually two sets in one. An underground shelter set was built directly below the main exterior 'tabletop' set.