If you're into the underwater habitat type thing try these:
Conshelf project
Sealab I and II
as well as check out this underwater hotel in Key Largo:
Hope this helps.
Although very, very expensive maybe you could check it out. They obviously have been doing something right.
James
If I remember right, this has been done somewhere here in the U.S. There
was no sub to take you down, but you would dive down via scuba equipment and
Wolf
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