USS
Charleston (SSN-704) is equipped with a
caterpillar drive and is on station following a nuclear exchange, under the command of Dwight Towers. A devastating war that contaminated the northern hemisphere was preceded by a standoff between the United States and
China after the latter blockaded and later invaded
Taiwan. Both countries are destroyed, as is most of the world. The submarine crew finds refuge in
Melbourne, Australia which the radioactive fallout has not yet reached (though radio communications with several radio operators farther north than Australia indicate that radiation has reached their countries and will be in Australia in a few months). Towers places his vessel under the command of the
Royal Australian Navy and is summoned to attend a briefing, partly regarding an automated digital broadcast coming from
Alaska in the Northern Hemisphere. The submarine is sent to investigate, with Towers, Australian scientist Julian Osborne, and Australian liaison officer Peter Holmes on board. Upon reaching Alaska, Towers and his
executive officer go ashore to find no survivors. Entering a house and seeing a dead family huddled on a bed, Towers thinks of his own family and what they must have endured. The source of the automated digital broadcast is traced to a television station whose broadcast, Towers and his executive officer discover, comes from a solar-powered
laptop trying to broadcast a documentary via satellite. While in Alaska, Towers' executive officer accidentally punctures his suit and injures his leg, but conceals the injury from Towers. Instead of returning directly to Melbourne, Towers orders the submarine to
San Francisco where most of the crew originated. The
Golden Gate Bridge has collapsed and the city shoreline is in ruins. A crew member who is from San Francisco abandons ship, planning on dying in his home city, and is left by his shipmates after it is argued that the length of time he has spent outside has already made him irreversibly sick with
radiation poisoning. Upon the
Charlestons return to Melbourne, the executive officer collapses and is diagnosed with terminal
radiation sickness. Towers attends to his old friend in his dying days and ultimately, at his request, euthanizes the man as his deteriorating condition causes him to experience extreme suffering. Towers returns to Moira Davidson, Holmes's sister-in-law and Osborne's ex-fiancée. As the people of Melbourne realize that the inevitable nuclear cloud will soon reach their location, their impending doom begins to unravel the social fabric; anarchy and chaos erupt. (This is in contrast to the 1959 film, in which most of the populace accepts their fate with grim resignation.) When radiation sickness appears in Melbourne, people begin lining up for government-issued suicide medication. After Mary and their small daughter Jenny fall ill, Peter and his family share a final moment before taking their doses together, Peter sorrowfully injecting his child. Osborne races around the
Phillip Island Grand Prix Circuit and finally crashes his car at Turn 10, resulting in a fiery death. With most of the
Charlestons crew members developing advanced radiation sickness, they ask to take the submarine on one final voyage to San Francisco. Though they know they are unlikely to survive the trip, they wish to die together on the
Charleston, the only real home they have left. Towers agrees, apparently abandoning Moira to be with his men. As Moira, about to take her own suicide pill, watches the
Charleston sail away, she is joined by Towers after all. Although it is not depicted onscreen, it is implied that Towers and Moira will later take their suicide pills together, given that there is no possibility of survival. ==Cast==