Allied Artists Pictures released this film on a double bill with Not of This Earth (1957) to many drive-in theaters with the tag line "Terrorama! Double Horror Sensation!"
When the scuba divers are rising to the surface (from the underwater camera shot), the water depth appears to be over 25 feet, yet when the camera angle changes to above, the divers immediately stand up after surfacing.
Depictions of earthquakes are accomplished by merely shaking the camera. While the scientist group moves about when the earthquake strikes, the sailor group doesn't move around at all.