Following the mysterious disappearance of an oil rig and a reconnaissance mini-submarine in the Gulf of Mexico, scientist Dr. Margaret Adams (Nicole Dickson) initiates the Armada Program, which consists of giant robots designed for deep sea rescue. The three robots - piloted by Red (David Chokachi), Tracy (Jackie Moore) and Jim (Treach) - dive nearly 800 fathoms to the sea bed, where they not only discover the mangled remains of the oil rig, but encounter the monster that brought it down. Red pursues the monster against orders from Admiral Hadley (Graham Greene), prompting the Admiral to order every naval fleet in the East Coast to converge to the oil rig's site.