Five passengers on a seaplane find that a crash has stranded them on an island used for nuclear testing in this disaster movie. Just to get to the island, they had to endure many hardships including a hurricane, a gun-battle, shark-infested seas, and a fire on the plane. Panic ensues when the diverse group learns that in five hours, another bomb will be tested there. While the story is action-based, most of the time is spent looking at the individual characters and the way they cope.