I watched bits of the surviving episodes of "The Underwater Menace" and it's just cheesy and I love it.
Polly, why are you moaning suggestively when you're almost turned into a fish person?
Anything with the Doctor and Zaroff is pure camp. From when the Doctor "accidentally" broke the machinery and Zaroff being honest that he just wants to destroy the world.
I don't see any of those weird fish people that they always show on the cover.