It was not a training dive. He was visiting someone in Canada and thought it would be fun to go diving. It was the Lillie Parsons.
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We have been diving for 28 years. Neither my wife nor I have ever run out of air. No one we have been diving with has run out of air. IMO, running out of air shows a complete lack of attention to what your are doing. Even if there were an equipment problem, your buddy should be able to observe and report to you.