The misadventures of a Florida family testing an underwater home. Tony Randall, Janet Leigh, Jim Backus, Roddy McDowall. Myrtle Ruth: Charlotte Rae. Cheever: Ken Berry. Tommie: Gary Tigerman. Merv Griffin: Himself. Jonah: Arnold Stang. Directed by Jack Arnold. A.k.a. "Sub-a-Dub-Dub."