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Reliable self-made Rebreather viability



New Member
Jan 2, 2023
Hi, I'm an open water diver, aerospace engineering student and also an electronics technician.

I am really interested in rebreathers but I'm also conscious of the complexity and the reliability they MUST have in order to be "safe" (even a perfectly working rebreather could lead to death due to human error). I know there is a lot of physics involved too.

The question is simple. Is there any possible way to design and build a PROPER AND RELIABLE rebreather? the materials need to be scuba grade, double redundant O2 and CO2 sensors, counter lungs, O2 tank, filler tank, valves, pipes, cables, ALL!!

I have electronics, mechanical, chemical and materials engineering professors at my disposal.

Disclaimer: I am very aware of the dangers like narcosis, hipoxia, hiperoxia, barotrauma, etc. I am also aware that I know very little of this things, also you need training in order to operate them. This will be a looong and scheduled project, with proper, step by step safe testing.

Thank you for your time
Kelpie Thyra

Kelpie Thyra

Mar 17, 2020
uhh... im kinda on the same train there, just don't have this many knowledgeable people around...
my start would be to get scuba certiefied and be trained on commercial rebreathers first before i try to modify one
(i'd like a sleeker, modular one, i could implement into my diving outfit / cosplay/costume)
  • Like

Deano 647

Jul 29, 2019
Back in the 90s and Oughts ppl used to hand build their own RBs. And they died like flies
Its only been in the last decade where the demand for RBs has driven the commercial (mass manufacture) of Res and components, that it has achieved CE status and (more importantly) ... safety.

Can you build your own RB? Yes you can.

Are you more likely to die on that vs a commercial unit like a Liberty, an XCCR or a JJ? Emphatically, yes.
I can tell you are young (ish) so money is a factor, and you are enthusiastic, but is it worth your life ?
There are HUNDREDS of deaths on. RBs ov er the years. Some due to mechanical failure, some to poor UI design that lead ppl to push 'Yes' to "Would you like to rest your PP02?"
Suck it up. Save your money. Buy a commercial RB. Save your life.

But I suspect this is waste advice ....


New Member
Nov 8, 2022
If this is a research project then you could post a summary of the ethics committee assessment?
I am concerned and posting from my own sense of ethics and the assessment / permission may free up the brain storming aspect.

With your skill set you should be able to satisfy the project criteria by having an oxidation chemical process supported by a rebreather , no human (or other life) required. Have lots of sensors and prove the concept. In fact another student may be able to make a seperate project of the O2 consumer mimic.
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