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Don’t think an accidental separation from a buddy is a solo dive, at least it shouldn’t be as both divers should take measures to reconnect, be it meet back on the surface or one surface and keep track of the other divers exhaust if there is any, Either way someone knows exactly where you were when you separated. In a solo dive no one knows where you are, no one can help or raise any kind of alarm, no amount of training will teach you how to deal with that, you have to come to terms with that yourself.
It seems people have different opinions of solo, I did a bit of solo sailing and never really thought of myself as being solo if I was in the company of other boats even though I was alone on my boat, I look on solo diving the same. If I’m in the company of other divers I’m not soloNot 100% accurate. That is one flavor of solo diving for sure. The most extreme kind actually but is not the industry definition. The widely accepted definition in the industry is diving without a buddy. It does not require that "now one knows where you are, no one can help or raise any kind of alarm."
For example, I regularly solo dive off of charter boats in South Florida. The boat knows when I went in, when I'm due back on the surface and roughly where to watch for my DSMB. But on the dive I am 100% solo. This is absolutely a solo dive.