Are there any recreational divers, using rebreather equipment in the UK? If so, what brand of rebreather are you using? Is it Closed circuit or Semi-Closed Circuit? http://www.nwdesigns.com/rebreathers/Default.htm I like the Draeger, as tested in this article.: http://sportdiver.com/article.jsp?ID=10392 I doubt, that I'll buy one anytime soon though when the suggested retail begins at $3,050 (And that was in July/Aug of 2000.) An interesting comment on rebreathers: "How deep can you dive?" This is a difficult question to answer because it varies based on the unit and circumstances. For instance, an O2 rebreather should be limited to 20 fsw, while there have been chamber lock out dives on closed circuit rebreathers over 1000fsw! In general, the limits for diving fully closed circuit units revolve around bail-out requirements more than the rebreathers themselves. It's difficult or impossible to carry enough bailout gas for a total system failure on the rebreather when you are making long deep dives. Having said this there are people in the world who regularly dive rebreathers over 400fsw. More typically rebreather divers stay under 200fsw just like regular divers but with extended bottom times."