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I have seen trailers approx. a year ago for an IMAX with some great shots of jellyfish...I don't think it was Into the Deep...I was under the impression that it was a whole IMAX about jeelyfish but I can't find anything about it anywhere...anyone see this and remember the name? Thanks!

No. I've seen lots of IMAX movies but I don't remember any of them involving "jeelyfish."

(Link goes to trailer)
"The Great Barrier Reef" (1981) is an IMAX film that has jellyfish in it. Is that the one you're looking for?