With their backs turned to the opposite porthole, a fish-like hand reaches into the cabin. That’s a fish Monsterarm and it’s going to try to grab them. Thankfully Dr. David Reed fends it off with a wooden bat.
The Creature From The Black Lagoon is a 1954 black and white 3D monster movie from Universal-International with creature design by Disney animator Millicent Patrick. Ben Chapman played the creature and Riccou Browning did underwater shots. The costume was so hot that the actors stayed in the studio lake to cool off.