A seismologist (William Leslie) has perfected a machine to predict earthquakes, and finds that one will strike California within 24 hours. But he and his mentor (Tris Coffin) are unable to convince the Governor to declare an emergency. A devastating quake occurs, and then new readings presage additional quakes all over the world. He and his assistant (Kathryn Grant) take his equipment deep into Carlsbad Caverns in hopes determining what is causing the pressure, and discover a volatile mineral previously unknown to science.

Kathryn Grant as Laura Hutchinson
William Leslie as Dr. David Conway
Tristram Coffin as Dr. Ellis Morton
Raymond Greenleaf as Gov. Chaney
Charles Evans as Gen. Bortes
Frank J. Scannell as Sheriff Quinn
I colorized this using AI software that doesn't always get the colors right, but I think it looks fairly natural. Hopefully a more professional job will be done someday.

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