Beast From Haunted Cave (1959)

Starring Michael Forest, Sheila Carol, Frank Wolff, Wally Campo, Richard Sinatra
Directed by Monte Hellman
(actor & director credits courtesy IMDB.com)

A criminal gang plan a heist of gold bars from a ski resort town, but while making their escape, are trailed by a ravenous monster.

A low budget but efficient creature thriller from Roger Corman's Filmgroup company, the picture isn't great, but isn't bad either, and the creature, with fearsome tentacles and lengthy strands of hair obscuring its face and body, is one to remember.  Wikipedia indicates the screenplay was based on the same material as some previous Corman pictures, notably Naked Paradise, and although that film had better actors in Richard Denning and Beverly Garland, the creature makes this edition more distinctive. 

The Incredible Petrified World (1957)

Starring John Carradine, Robert Clarke, Phyllis Coates, Allen Windsor, Sheila Noonan
Directed by Jerry Warren
(actor & director credits courtesy IMDB.com)

The maiden voyage of a diving bell ends in tragedy as the chain breaks, stranding its four passengers on the ocean floor, but they're able to make their way into an underground series of caverns.

One of the films of the notorious Jerry Warren, this picture's actually not too bad, despite the director's reputation for making haphazard films, often recutting foreign pictures and adding endless-seeming narration to explain the plots.  This effort's an original adventure as far as I know, although Warren cuts in plenty of stock footage, but held my interest despite its obvious flaws.  Although the film's not a highlight of any of its actors' careers, Coates fares worst, saddled with a witchy character whose fits of anger and jealousy don't seem to make any sense.