In 1994, the Marines are testing a new missile, but after the launch it mysteriously disappears and it's clear that if the rocket reaches civilian areas they will be in big trouble. Carol Dawson, a journalist, is alerted by an unusual sight of whales in the Miami area, and decides to go and write about it.
Armed with special equipment provided by her friend, Dr. Dale Michaels from MOI (Miami Oceanographic Institute), goes to investigate the rumors of a missing missile belonging to the Marines and that could be behind the mysterious whale behavior lately. She hires the services of Nick Williams and Jefferson Troy, owners of a little boat so she can get to the Gulf of Mexico and investigate closer if a missile has something to do with all of the above.
They end up finding an unknown artifact, bringing a lot of doubts about its nature, and even if it's part of a lost treasure that could be worth millions. Old friends of Williams and Troy noticed the finding and just like the old times, they want to steal it from them.