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Yes, I was a farmer when young...I know well what that crap is like. You'd have to pour a concrete box with a top entrance. Then MAYBE...unless it floated right up out.

Specially where you are, damp through winter.

Pretty funny though, I've slept in many, many bunkers and you get far from an ideal sleep. The noise of action close by will still wake you. Damp, yes that would describe it. And the cup of tea...