AfterDark
Contributor
Negative on that. No agency is going to teach you the "treat it like a cave" approach because it can't be done within any standard. Lost and cut line are particularly problematic (they are bad enough in a cave but at least you have walls, a ceiling, and tieoffs to help you look - potentially for the last few minutes of your life). There is no way to teach someone how to exit a giant expanse of silt with no walls, no tieoffs, and no flow when they lose or cut the line. You can do that on your own but no agency and no insurer is going to buy off on someone teaching you how to endanger yourself.
There are a few sites where it's no suicidal. For well trained divers, Morrison's Quarry in Quebec is quite reasonable to dive like a well lite cave - everywhere else forget it.
A good read is Cousteau's diving expeditions under the Artic ice. No lines, 100FSW and current. We had to keep an eye on the hole at all times. Not a direct quote but along those lines. Big balls.