Captain Juan Cabrillo and a team of mercenaries from the ship Oregon, who miraculously survived the bloodbath on the Congo River, receive a distress signal from a small ship that came under fire from Africans. One of the rescued, the beautiful Sloane McIntyre, asks Juan to help her in the search legendary diamonds buried somewhere in the ocean along with an English ship that sank in 1896. Those who lift these stones from the bottom will become the richest people in the world. Captain Cabrillo agrees to share with Sloane McIntyre. But the search for sunken diamonds turns into mortal danger, when mysterious criminals using new, cutting-edge weapons go hunting for treasure hunters...