I may be wrong, but I am unaware of any of the tec agencies teaching this program. There are lots of things to consider when it comes to this program. Lets see where this thread goes.
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Rick Murchison once bubbled...
You left off "insane."
Rick
Pez de Diablo once bubbled...
It's rec diving IMHO, yes you are in an overhead environment, but you are tethered to the surface. You (typically) don't dive further than 130' linear feet from the entry point (I think this is within PADI rec limits definition). You do not require a redundant set-up. And if you have a problem you can ascend directly up your tether to the entry point, just like you would on any open water dive - albeit on a bit of an angle.
You should dive with a environmentally sealed 1st stage to prevent freeze up and where I live, that is part of my regular kit - right along with the chain saw. Nothing technical about it. Heck, my first ice dive was in a wet suit.
Diver0001 once bubbled...
In a cave you are "tethered to the surface" too in the sense that you have a continuous line to open water. What's the difference?
R..