Monster from the Ocean Floor

Julie, an American on vacation in Mexico, spots a giant, one-eyed amoeba rising from the ocean, but when she tries to tell the authorities, no one believes her. She finally teams up with a marine biologist in an attempt to destroy it.

Monster from the Ocean Floor is a 1954 horror sci-fi movie directed by Wyott Ordung, starring Anne Kimbell, Dick Pinner, Stuart Wade. It holds an IMDb rating of 3.8/10 from 1,243 votes and runs 1h 4m.