I'm curious:
How difficult/expensive would it be to convert something like an old salt mine into a shooting range? The big advantages would be the ability to shoot year round, 24 hours a day, plus no noise complaints or lead disposal hassles or stray round worries, plus extreme privacy (no BATF agent is going to drop in on you when you're 100+ feet underground).
Obviously, ventilation would be a big problem, plus you'd have a long elevator ride up and down, plus you'd need to have some sort of engineering inspections to be sure the place was still safe.
This occurred to me as I was reading about the old salt mines under Detroit and Cleveland. The thought of running a range right underneath [literally] the noses of all the anti-gun politicians is just delicious. [8D]
Are there any mining experts here?