I guess I'm trying to understand how much of an opportunitythere is here, and assuming the existing tunnel boring companies have at least considered this, I gue

I guess I'm trying to understand how much of an opportunitythere is here, and assuming the existing tunnel boring companies have at least considered this, I guess the most possible gain you could get out of this would be whatever it would cost to pay people to do it manually (otherwise, the pros would out weight the cons, and a company would have done it that way). But I wouldn't have thought it would cost that much to have people do this, so Im left unsure how large the opportunity is here.