Sometimes you come across divers who are short on knowledge and very quick to share the fact. In reply you might share what you see in the link below. The link is the Cousteau crew diving on the wreck of the Britannic, sister ship to Titanic. And guess what.... they are diving with La Spirotechnique single stage, double hose Royal Mistrals. They are diving at two hundred and forty feet using triple tanks, probably aluminum 88s. If you look closely you will see extended hoses on the deep rigs. This is the full 1977 episode and runs about 50 minutes. I hope you enjoy it.
See: http://www.youtube.com/watch?v=UVNJgDiygbc
Steve