Quote: (Originally Posted by
marcinkr)

...called " Big Hall" (predessessor of the Rebreather 80)
Never heard of that. Are you sure it is not the PVR-BASC ?
I owned one (a long time ago) and IIRC, there was no manual.
Errol Kalayci used to teach the course for it (IANTD first, then GUE) so he started to write an article about it, I think I still have a copy laying around. It doesn't contain how-to-dive instructions though...