Review by lor_

One of my sci-fi/horror/fantasy reviews written 50 years ago: Directed by Francis D. Lyon; Produced by Earle Lyon, for United Pictures, released by Feature Film Corporation of America. Screenplay by Arthur C. Pierce; Photography by Brick Marquard; Edited by Robert Eisen; Music by Paul Dunlap. Starring: Scott Brady, Sheree North, Gary Merrill, John Howard, Wende Wagner and Biff Elliot.

Science-fiction adventure revolving around perilous underwater scientific exploration and the uncovering of a man-like amphibian monster, of fishy parentage. Suffers from a low-grade production despite nice cast.