LoisLane
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In regards to some of the sheds and out-buildings... I found these comments online as related to underground shelters... I find it interesting.
"look for an emergency exit hatch or air vent, sometimes they were combined. If the local government sealed the place then they could have placed rocks or concrete slab on top of such an exit, or it could only be openable from the inside. I read that in some US missile silos they consisted of a metal pipe with a ladder, with the top half full of sand. You open a hatch halfway up the pipe (below the sand) then pull a lever releasing the sand to fall into the lower half. After that you can re-enter the pipe and climb up to the surface. I'm not trying to discourage you, just be aware that the hatch might not be too obvious."
"look for an emergency exit hatch or air vent, sometimes they were combined. If the local government sealed the place then they could have placed rocks or concrete slab on top of such an exit, or it could only be openable from the inside. I read that in some US missile silos they consisted of a metal pipe with a ladder, with the top half full of sand. You open a hatch halfway up the pipe (below the sand) then pull a lever releasing the sand to fall into the lower half. After that you can re-enter the pipe and climb up to the surface. I'm not trying to discourage you, just be aware that the hatch might not be too obvious."