...solo technical diving on a ccr. I'm not the only one, many others out there I'm aware about. Not a surprising mindset given how self-sufficient the breather makes individual users. Putting the rights and wrongs of it to one side, what do those that solo dive do to increase redundancy and mitigate risks. I have several things up my sleeve to which I'm adding a separate small O2 cylinder for boom scenarios and so on. What do others do to enhance their units should the poo hit the fan?