My last house, I built a concrete vault. Poured in place with 1" rebar in the 18" walls. I put a vault door on it. The most important thing is to have it well ventilated so moisture does not build up. Dedicated HVAC/elec/com/water if you are going to use for a safe room. Emergency toilet facilities or bathroom. You can spend a fortune depending on what you want in building a safe room.
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canis fidelis cave canem, vereor non magnus nocens lupus
In hoc signo vinces
If you can list them, you ain't got enough!!!
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