Low budget though not low interest science fiction.
Dr Conway (William Leslie) has developed a machine that can predict earthquakes. Unfortunately he has predicted that an earthquake is about to hit California in the next twenty four hours and even more unfortunately his machine appears to work when a quake does hit!
Conway's machine detects more imminent earthquakes but doesn't know what is causing these quakes. With his assistant Laura (Kathryn Grant), he descends into a cavern to see if he can discover the cause. He discovers a dangerous new element which could destroy the world in days...
This is a bit of a pedestrian film that takes a while to get going but ultimately is worth persevering with. An fairly intelligent science-fiction plot (for the period especially) and good use of stock footage overcomes the shortcomings with the budget. A reasonable little film.
