I have never done it. I don't quite understand it. I've spend some time in various darkrooms over the years, with and without a safelight, and the important thing with all of them was to have a clear floor and to know where everything was. If I were stuck somewhere where I had no light, I'd most likely just stay put.

Is this one of those exercises where you're put in an artificial state of weakness to learn to depend on others and improve your "teambuilding skills"? Have to say I've never understood the point of that either, except as a conditioning mechanism.

I would suggest a helmet of some sort, a walking staff, and one of those thermal game finders that makes a tone depending on the heat of the object you point it at.

I don't mean to be negative, I just truly don't understand the point.