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It is important to clarify what responsible solo scuba diving is. PADI views it as a form of technical diving and not for everybody. To responsibly engage in solo scuba diving, a diver must first be highly experienced, have a hundred or so buddy accompanied scuba dives, be absolutely self-reliant and apply the specialized procedures and equipment needed to engage in the activity. This includes, but is not limited to redundant air sources, specialized equipment configurations, specific dive planning, and management of solo diving problems and emergencies. When solo diving is performed within this description, we see a place for it. Responsible solo diving is not diving alone without the mental discipline, attitude or equipment.
My problem with this and so many similar articles is they use statistics like this: "Since 1989, there were at least 538 fatalities where it was clear divers were either intentionally diving solo, or became separated from a buddy and were de facto alone."
You can't compare the two. They are completely different disciplines with different gear, skills, protocols and mind sets.