I remember seeing this one in the theater back in its first(only?) general release. I was happy, being a clueless 9 year old,  with the fantastic content, particularly when the Earth's globe is shown in the "sky" of the remarkably earth-like comet, and the guest appearance of the familiar crocodiles-with-fins-glued-on-their backs dinosaurs.

But I was in no way prepared for the Joan Staley underwater swimming scene.

And neither was the audience, who went absolutely wild with hooting and hollering as Ms. Staley's chestal assets were exposed to a degree seldom seen on the silver screen at the time, and for what seemed like forever.

Too young at that point to have an overtly sexual response to this, I simply became steadily more uncomfortable, praying fervently for the end of this sequence.

Whew.

"Men, there's a drive-in movie full of juicy people! Wow! " -  PIC Mosquito Coil Ad