Harryhausen!

 

IT CAME FROM BENEATH THE SEA-1955-Commander Pete Mathews (Kenneth Tobey) and professor Leslie Joyce (Faith Domergue; in THIS ISLAND EARTH the same year) are friendemies investigating a strange occurrence at sea. Brilliant scientist John Carter (Donald Curtis) joins them. They figure out it's a giant octopus which attacks and sinks a ship. While checking out the incident the trio come face to face with the monster and it kills a local deputy (Harry Lauter). Later it attacks the Golden Gate Bridge. Pete and John head a submarine to blow up the creature after it terrorizes San Francisco. It traps their sub and Pete has to go out and plant explosives. 

Despite a low budget this features some great Ray Harryhausen sfx. Too bad director Robert Gordon (THE JOE LOUIS STORY; a former actor) went into TV soon after this.

Thanks for reading!