UNKNOWN WORLD(1951)
In the set: 100 Greatest Sci-Fi Classics

Not a bad little movie, but unfortunately, this
crashes at a little more than an hour in! C+

A review from IMDb.com:

A group of scientists drive an enclosed vehicle
into an extinct volcano and then bore more than
a thousand miles into the earth. They're searching
for underground sanctuaries in case the surface
of the earth becomes uninhabitable due to nuclear
warfare. This is one of those low-budget,
black-and-white films from the 50's that you
want to laugh at it, and while it does have
its share of bad dialog and cheesy special
effects, there's an earnest, committed quality
here which eventually overcomes most of the
obvious faults. Viewers looking for cheap
thrills will be disappointed. - dinky-4

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