Monster from the Ocean Floor (1954)
Monster from the Ocean Floor is a 1954 science fiction film about a sea monster that terrorizes a cove in Mexico. The film was directed by Wyott Ordung and starred Anne Kimbell and Stuart Wade. Wade also starred in other low-budget films during the decade including Tarantula (1955), and Teenage Monster (1958). Producer Roger Corman also appeared in a cameo in the film. It was the second film that Corman produced.
More at Wikipedia.