Crack in the World 1965
He and Sorensen then pore over spectrographic data and films of old nuclear detonations, and finally realize what has happened: the missile touched off a fusion explosion in a layer of hydrogen in a pocket beneath the magma, so that the force of the explosion was greater than Sorensen expected.
But this finding also suggests a solution: /another/ detonation in the path of the crack could break a gaping hole in the crust; the crack would run into it and stop. Rampian sets out with a heat-shielded fission bomb and asks a fellow scientist, Steele (Mike Steen), to descend into a dormant volcano crater with him to drop the bomb into the lava.
Steele dies when the bomb, catching Steele's line between itself and the surrounding rock, parts the cable and sends Steele falling into the lava pit. Rampian, nearly overcome with grief, barely manages to release the bomb into the lava before he collapses at his line, overcome by the heat. The crew hastily haul him up and take him off the island, to a nearby island where they give the signal to set the bomb off.
The bomb blows the volcano cone away, and at the Project site, the seismologists confidently believe that the crack has in fact stopped. Then Dr. Evans sends a message to Maggie informing her of the truth about her husband: that his disease is malignant, terminal, and will kill him within a week. She takes a tearful leave of Ted and prepares to rush back to Sorensen's side.
But then another earthquake in the Indian Ocean signals that the crack has *not* stopped, but has changed direction. Rampian asks Sorensen to be more specific, and when he hears where the new quake's epicenter was, he realizes that the crack has doubled back toward the Project's original bore hole--a course that might not have the dire consequences of cleaving the crust into two equal hemispheres.
But the crack is now moving at twice its original speed. Rampian rushes back to South Africa to observe the crack's progress personally. He and Maggie soon realize that *two* cracks have opened in the crust, both converging on the bore hole.
Rampian orders an evacuation of a nearby village--but can then only watch helplessly as an evacuation train heads directly for the crack, and is wrecked when the crack knocks over a trestle while the train is trying to cross it. Frustrated, Rampian orders another evacuation, and then he and Maggie return to the Project.
There they find that Sorensen has ordered a full evacuation--but Sorensen has stayed below in the bunker and won't come up! Maggie and Rampian take the elevator down, to find Sorensen sitting alone at the consoles. He says that he will personally record what he believes will be the birth of a new moon.
Of course, he really is suicidal, a fact he makes clear when he sends Rampian and Maggie out of the control room on separate errands--and then abruptly shuts the heavy door, locking himself in, and then shorts out the motors that move the door.
Heartsick, Rampian and Maggie race for the elevator to take it topside--but then a boulder smashes into the elevator cab, stopping it about halfway up. Desperately the two climb through the trap door and up the elevator shaft, and then climb uphill away from the bore hole as fast as they can.
Finally the two cracks meet at the bore hole, and a gigantic disk of crust lifts up into space, to join the Moon in orbit. After which the earthquake activity stops, and small animals come out of hiding as Rampian and Maggie comfort one another, happy to be alive in a world that can still sustain them.
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