Thanks for the link.
There is a guy (I think he is in Hawaii) that has been reproducing or maybe rebuilding one of the suits from 20,000 Leagues Under The Sea, Disney movie.
My understanding is that the suits were basically modified hard hat rigs with Broxton type double hose reguators feeding their air supply.
Here's the link to Pat's site that Luis is speaking of.
Disney Nautilus: A 1/10 Disney Nautilus homebuilt submarine