Dave, working with the DIR people and trying to incorporate as much of that into my diving as I can would not stop me from diving solo . . . What stops me from doing it is my risk-averse temperament. Once I start diving doubles, it would be more tempting because I'd have some redundancy, but there's still entanglement . . . Maybe I'm just not that brave. And most of the time, I don't lack for somebody to go diving with!