Kadro (11)
Ben GazzaraCmdr. Adrian Blake
Walter PidgeonDr. Samuel Andrews
Ernest BorgnineChief Diver Don MacKay
Yvette MimieuxDr. Leah Jansen
Donnelly RhodesDiver Bob Cousins
Chris WigginsCapt. Williams
Mark WalkerDiver Dave Moulton
Leslie CarlsonBrigs, Triton Radioman
Stuart GillardDiver Phil Bradley
Michael J. ReynoldsDr. Hal Hamilton
Kei FujiwaraKay, lab technician