When thinking of a catchy film title, "The Incredible Petrified World" is a strange one, as by the third word, you are starting to think of frozen stillness becoming lifeless. So, in this case, it is an apt title.
The simple problem with this film is nothing happens; and it seems forever to occur.
Our four heroes (sorry, two heroes and two women, judging by the subservient roles given to the female leads, and the bleak plot warning that if you step out of line, men will hate and leave you) go down in a dodgy diving bell, which conveniently fails at depth near an underwater cave that glows in the dark (phosphorus they explain). I could be critical of the science at this point, but this claim pales with the completely unexplained manner they can snorkel in and out of the diving bell without it being flooded.
Anyway, once they reach the Incredible Petrified World (aka small cave with glowing walls), they eventually meet a stranger who claims he got there from a shipwreck 14yrs ago. Now, it would have been good if they explained how he might have been able to swim so deep without being scuba supported, although it would have been better to explain why they chose to make him look like Chico Marx with a Santa beard, and wearing caveman clothes.
And thats the main problem; you don't mind putting up with the first three quarters being tedious if there is a payoff. Alas, in this case, the payoff is just the remaining tedious quarter.
