The Incredible Petrified World
A 1959 film starring John Carradine and directed by Jerry Warren(Wild World of Batwoman)!
It's about 4 underwater explorers who get stuck in a underwater cavern.
https://en.wikipedia.org/wiki/The_Incredible_Petrified_World
https://www.imdb.com/title/tt0053944/
https://youtu.be/uHxabkN00qM
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Bob Jones
shared this idea
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David Kneib commented
It's a Jerry Warren film with John Carradine for Pete's sake...what more do you need to know????