Dr. Lecter
Contributor
We aren't far off on that. Though rather than depth I'd say it's when I've got to do more than two gas switches. So for me that's probably ~200 feet based on typical gas choices. After which I both want a team and a rebreather.
So I guess that leaves me with, "any dive I'm willing to do on open circuit I'm willing to do solo"
I was referring solely to narcotic issues on air, and not to any other risk factors.