A team of scientists working to raise a sunken Russian nuclear submarine on an ocean platform off the coast of Miami, Florida, unearth an ancient Atlantean relic from the sea floor and bring in an expert to make some sense of it. But while attempting to raise the sub, radioactive leakage from its missles triggers the re-emergence of Atlantis, and the resulting tidal wave destroys the platform and leaves only a small group of survivors. Rescued by two Vietnamvets-turned-heavies who are out relaxing after their latest job, their boat eventually runs aground on a Carribean island nearby where, upon going ashore, it is discovered that everything has been destroyed and everybody killed. The culprits, a vicious group of well-armed raiders, and their leader, Crystal Skull, are descendants of Atlantis’ original race who set about reclaiming the world and adding the survivors to the list of victims as they struggle to stay alive and defeat the raiders and send Atlantis back to the ocean floor.

Lewis Collins is back to leading mercenaries on the move in Southeast Asia. This time the cast is unusually good including Lee Van Cleef, Brett Halsey (Cop Game), Romano Puppo (Robowar), Mike Monty (Raiders of Atlantis), Bobby Rhodes (The Great Alligator), etc. Anyway, Van Cleef has Collins go on some random mission to locate a disc with all sorts of valuable crazy intelligence data on it. It just happens that Donald Pleasence, a random government official, hires another mercenary-for-hire Manfred Lehman to tag along and make sure the data ends up in the right hands. Van Cleef isn’t taking any chances, and since he is crooked and murders Collins’s other bosses quickly, he places Romano Puppo in the group as well to make sure the operation runs smoothly. Collins may not be too expressive but at least he seems to figure out quickly who’s out to get him, so the mission continues with lots of double-crosses, twists and turns, and of course lots of explosions!