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Dr. David Conway has been developing a machine that will allow him to predict earthquakes and other seismic activity. By the time its perfected the machine predicts a major earthquake for the next day. He and his colleague Dr, Ellis Morton try to forewarn the Governor but its too late to do anything. The subsequent earthquake is devastating. They head deep into the Carlsbad caverns to determine what might be causing the pressure. What they find is an unknown volatile mineral that is safe when wet but expands and eventually explodes when dry. The mineral has been pushed to the surface and their only solution is to flood those areas where the mineral is found.
Kathryn Grant
Laura Hutchinson
William Leslie
Dr. David Conway
Tristram Coffin
Dr. Ellis Morton
Raymond Greenleaf
Gov. Chaney
Charles Evans
Gen. Bortes
Frank J. Scannell
Sheriff Quinn
Marshall Reed
General's Aide
Fred Coby
Ranger Brown
Paul Savage
Ranger Kirk
Terry Frost
Chief Rescue Worker
Richard Alexander
Workman
Leon Alton
Scientist
David Armstrong
Military Policeman
Paul Bradley
Scientist
John Close
Soldier
Oliver Cross
Scientist
Roy Damron
Ranger
Dan Dowling
Scientist
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