Hello Down There (rereleased in 1974 as Sub-A-Dub-Dub) is a 1969 American comedy-adventure film starring Tony Randall and Janet Leigh that was released by Paramount Pictures.

The group are soon joined by a live-in seal named Gladys and a pair of dolphins that stay close at hand and fend off sharks.

After learning that they are living under the sea, he schemes to bring Griffin and the TV crew down to the Green Onion, but the navy is alerted to the sound of the music and becomes suspicious.

In a contemporary review for The New York Times, critic A.H. Weiler called the film an "amiable mishmash" and wrote: "Mr. Randall, looking woebegone and harried, berates his nervous spouse: 'You can't ignore 71 per cent of the earth's surface simply because it's under water.'

"[4] A Daily News review was also lukewarm, calling Hello Down There a "typical, routine family comedy for general audiences" while praising the underwater photography as well as the seal and dolphins "... who seem to act more sensibly than the adults.