The Thunderstrike, a satellite designed to destroy missiles before they hit their target, is launched into space. Buck Stevens, the owner of the satellite, his daughter Tiffany, Tiffany's estranged boyfriend Kevin Thomas,who's also the designer of the satellite, security advisor Frank Ewing, and Judy Campbell, Buck's pregnant employee, are flying to Hawaii for further tests on a private Boeing 747-100. CIA agent Jim Carpenter is hired to escort them to Hawaii. The pilot of the flight is killed, and is replaced by his murderer Richard Layton. As the 747 takes off, Layton kills the copilot, and crashes the 747 into the ocean. It sinks to the ocean floor, and a crew member is killed in the chaos, although all of the passengers survive. A group of divers then arrive, led by Jeff Cort, although they're revealed to be Layton's accomplices who plan on stealing the computer that will be used to launch the Thunderstrike in the cargo hold. Cort betrays Layton, and fatally shoots him with a spear, and also shoots Jim. The divers then leave along with Ewing, who is Cort's accomplice. They then begin to fly back to the mansion of arms dealer Owen Cantrell, although during the flight, Cantrell betrays Cort by fatally shooting him.