It may have been part of the banna splits? People dressed up as sea creatures. I remember names of the caraters like squidly and sea hag. They live uder ground in the rocks. Please help it's driving me nuts!

Sigmund and the seamonsters?

The Amazing Live Sea Monkeys?

sigmund and the seamonsters?

Thank you very much

The Banana Splits did have a segment intitled ,'Danger Island' but I myself never remember any sea creatures in it