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The DEEP
A lot of the underwater stuff was done on the Rhone in 1975 or 76. But most like it for this:
JACQUELINE BISSET - REMEMBER THE WET T-SHIRT "THE DEEP"
See the move trailer here:
Google Image Result for http://www.sofacinema.co.uk/guardian/images/products/3/1893-large.jpg
Le Grand Bleu. (don't know what title it has in English)
Was it 'The abyss' where they were breathing some sort of liquid?
Does such a system exist or is it just theory?