Honda also intended to show how the inhabitants of Infant Island survived a nuclear blast but budget cost forced him to use a bland cave instead. Honda wanted to create a type of mold for the island and asked the art department to create it but this idea was dropped due to budget costs. The Infant Island natives were portrayed by Japanese actors in dark makeup. The live-action Dam footage was filmed in Kurobe Dam. During a production meeting, Tsuburaya told the staff he wanted four water tanks to create the raging waters that breaks the dam. Tsuburaya's Chief Assistant Art Director instead built 12 tanks, which held 4,320 gallons of water.