  intel-flags-venezuelan-prison-gangs -growing-influence-in-16-states-708 5126 again, use bricks or concrete, steel frame, you are the masters of steel, if i was capable of doing something that endured 27/f then you will be capable of doing a bunker, cover it with burned cardboard and fill the gap with homemade aired concrete, cover it with mud or something created by you (you are the masters of it) do at least a one meter cheap concrete sidewalk surrounding everything, avoid plants, only small windows, metal doors in your windows.
Chile