Audio problem: Throughout the movie when they are underground, when someone speaks sometimes you hear an echo and sometimes you don't.

Journey to the Center of the Earth (1959)
1 audio problem - chronological order
Directed by: Henry Levin
Starring: James Mason, Diane Baker, Pat Boone, Arlene Dahl, Alan Napier, Peter Ronson, Robert Adler, Thayer David

Visible crew/equipment: A giant lizard grabs hold of Mason with its very long tongue. Cables can be seen around the fake tongue which are both wrapped around Mason's left leg. (02:00:10)
Sir Oliver Lindenbrook: A field of force that snatches gold away! This is it, this is it! The junction of magnetic forces from the North Pole to the South Pole - the center of the earth.
Trivia: The dimitrodon, the dinosaur in the middle of the movie, is actually a real lizard (a basilisk, in fact) with a sail glued onto its back.
Question: When the gang explore the ruins of the city, you can hear a low pitch humming noise. What was making that noise?
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Answer: It's just an added sound effect that foreshadows an ominous event (the giant reptile) that is about to happen. It's not meant to be anything naturally occurring.
raywest ★