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Project background

I decided to start building a semi-closed rebreather in the fall of 2002; However, my first SCR prototype was less than perfect. I knew that I had to find a different way to connect the hoses to my breathing bags, find new gear design, cut hose lengths, find new balance, etc. Today it is more than 10 years ago that I started my rebreather journey, it has been a hell of a ride! Sometimes people ask me if it has been worth it, considering all the time and money I have spent on this project. I answer them, yes it has! I have had the honor to meet some very interesting people along the journey which have really inspired me, and it has also fueled my day work as well. It is very challenging, and sometimes extremely frustrating. But hey, without the challenge there is no reward! The enormous feeling of joy when you finish a toll gate in an extremely challenging project, that makes life worth living! Also building, creating things from nothing, makes life more fulfilling, and then being able to dive it; Well, that is just an added bonus to life! ;=) Live life, go diving!


Today in the Hunchback project I use the Golem gear counter lungs (BMCL), standard p-connector from Dräger, T-adapters from Golem gear, and our own designed rebreather canister which is developed here in Sweden. We use standard Ray hoses, standard first stages (Apeks and Poseidon), standard 3 liter Alu bottles, standard LP and HP hoses, etc. All my parts, except for the Hunchback designed parts, are standard products found on the regular scuba market on the Internet. All of these “regular” parts can be bought on the web through different web shops and dealers. The parts that we have designed are the HB Canister and the "SS fishbone adapter" for the back plate. The back plate and wing are from AGIR, a small Swedish manufacturer for quality dive gear. The main idea is to recycle as much dive gear as possible from the conventional scuba market on the Internet and convert it to a "safe", fun & practical rebreather unit, with a maximum dive depth of 65 meters. That is my ultimate goal with this project. But having fun and learning new things along the road is a fantastic added bonus! ;=)The Hunchback has been manually tested (by test dive lab rats, such as your writer…) down to 40 meters in the field and it works well. It is easy to swim with, perfect trim in the water, and (perceived, not measured) easy to breath. If anyone can give me time in an ANSTI machine, please email me!

HB V10
Picture by Erik Tjäderqvist

This rebreather project is still alive and kicking! I have carried out several improvements (CSI cycle 41) during 2012. I have continued to develop some new ideas around the Hunchback concept, but version 10 is now the active in water version and is undergoing testing by me. I am adding new information about this version on my HB blog  now during 2013. Please follow the blog for more updated information around the trials and my personal thoughts around the project and version 10. 

//Carl Wern Rådmansö/Sweden 17-02-2013