This is no better or worse than a lot of b-movies. The 50s and 60s spawned hundreds like this. Written & directed by Leonard Katzman who was the huge force behind Dallas in the 80s it is average for sci-fi of the time. The scenes underwater seem to be in a fish bowl. James Brown was a stoic(even emotionless)as the hero. He was later Det. McSween on Dallas under Katzman. Katzman also had a hand in the Wild Wild West TV show. If you like b-movies for the fun of " making fun" this is for you. I like this type of picture But to each his own. Francine York is worth a look. Their is no true science in the picture. I give it and overall b-rating of 5.