How often do you have catastrophic failures? Solo diving without an RBS is a simple cost-benefit analysis. The benefit of solo diving weighed against the chance of a catastrophic failure and its potential outcome (negative outcomes can be mitigated by diving shallower, unless the solo diver is proficient in deeper water OOA ascents).
Personally, I have no problem diving solo without RBS in the 30-40' range where there are absolutely no decompression or safety stop issues and I could easily make the ascent without panicking and holding my breath. A bit deeper, at the 50-80' range, I start to worry a bit and keep my time at those depths limited. The one time I did 115' in cold water, I was so narced that I didn't worry about anything at all.
Personally, I have no problem diving solo without RBS in the 30-40' range where there are absolutely no decompression or safety stop issues and I could easily make the ascent without panicking and holding my breath. A bit deeper, at the 50-80' range, I start to worry a bit and keep my time at those depths limited. The one time I did 115' in cold water, I was so narced that I didn't worry about anything at all.
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