This movie has a lot of charm. There are the wondrous conventions of Sixties scifi: bold colors and sleek design, underwater cities built in miniature, torpedo battles, a safety-striped submarine, and even a Nehru-suited mad man. But Sonny Chiba is the most charming thing in Terror Beneath The Sea.
And just where is Sonny Chiba in all this, you may ask? Well, he does have his heroic moments, but the top-billed star seems mostly content to blend into the background and let all of the insanity just happen around him. Which is a very sensible attitude to take.