First, if you are reading this, you probably found out about it from the Rebreather Website. The rebreather mailing list hosted by our friends at Northwood Designs is the center of rebreather discussion worldwide. Subscribe and participate.

Richard Pyles article "A Learner's Guide To Closed-Circuit Rebreather Operations" is THE classic article on the issues of diving with this type of equipment. Rich is likely the most experienced deep-rebreather diver in the world. Listen to the man! Rich's accompanying article, "What is a "Rebreather"?" is a good basic starting place as well.

For Mark-15 specific information, much of which is just good common sense for other rebreathers, the series of articles written by Kevin Juergensen stand as accurate and detailed information from a REAL expert: First, Kevin's Basic Introduction to the Biomarine Mark-15 is excellent. Second, Kevin's specialized "Mark-15 Maintenance Manual" is also superb. He ought to sell it, but it's free.

The Australian Amateur Rebreather Group is top-notch. Read and learn from these guys.

For supplies, many of us have found Pat Duffy to offer us good deals on oxygen sensors. Plus he'll tell you (for FREE) how to build a cheap 02 analyzer. Take a look at his site HERE.

Want to try to build your own PP02 measurement system for your rig? Mark Monro has  made up circuit boards and sells them, as well as most of the parts, for -cheap-. You can add a 3-sensor PP02 monitor to your homebrew rig for under $200 with a little bit of elbow-grease and solder.

Many of us buy our scrubber material (Sofnolime) from the  folks that host the rebreather website. We appreciate their server space, and they don't try to moderate or otherwise interfere with the content of the email list that we enjoy so much. Help them out by buying your scrubber stuff from them. It's competitively priced (Naah.... it's CHEAP), and they are good guys. Here's a good site on this stuff.

My friend Enrique Alverez is a wizard at stainless-steel fabrication, and is an expert wreck-diver as well. He makes a line of stainless steel diving goodies of superb quality, and has made up several custom rebreather backplates and bailout bottle mounts. If you need Stainless Steel work done, visit the master.

Lastly, diving with a rebreather is not kids stuff. It's a blood-sport, meaning that if you make a mistake, you DIE. I'm not kidding. The best helper that you can bring with you is your brain. Read this article on self-sufficiency and think it over. Then come back and read my short missive on "Playing Games for Keeps".