The climactic underwater battle was shot at Clifton Pier and was choreographed by Hollywood expert Ricou Browning, who had worked on "Creature From the Black Lagoon" in 1954 and other films. He was responsible for the staging of the cave sequence and the battle scenes beneath "Disco Volante" and called in his specialist team of divers who posed as those engaged in the onslaught. Voit provided much of the underwater gear, including the Aqua-Lungs, in exchange for product placement and film tie-in merchandise. The ability to breathe underwater for extended periods of time was a new product that had previously been used by underwater explorer Jacques Cousteau and using it in a movie was a new approach. Lamar Boren, an underwater photographer, was hired to shoot all of the sequences. Filming ceased in May 1965, and the final scene shot was the physical fight on the bridge of "Disco Volante".