Re: Northern Ireland ground crew!?
Rock Burg can withstand winds of tens of hundreds of miles an hour. Granite mountains withstand aeons of precipitation and wind scouring with only a slight bumping.
In short, a cave would in my advice need to be 100 or so meters deep to be safe, and with a nice twisted wind baffling entrance.
Do not forget though, if all else fails, a basement in your home is better by far than nothing.
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