I apologize for the YouTube canned music, but my Mac is acting up. This video was made at the Historical Diving Society Rally in Australia. The beginning shows the training class and helmet diving, followed by a pool session with double hose gear. The members got a class room lecture on the history and maintenance of double hose scuba, then headed to the local pool.
https://www.youtube.com/watch?v=1H6CMAcNsI4
[video]https://youtu.be/1H6CMAcNsI4[/video]