How does dry stacking work for underground shelters? For comparison, assuming you wanted to build a underground shelter that had the same dimensions as a 40' shipping container? I'm thinking build a 40 x 8 basement with drystacking, then for a roof, just cover it with a shipping container. Build a trap door in the container and you just doubled your storage space. cut some slots in the container for lookout. Keep everything in the lower unit including sleeping quarters. leave the top container full of less valuable items. if someone torches into the upper container they get your junk, but don't know that there's a treasure under their feet.... thoughts?
2nd Law: In a closed system, the entropy of the system will either remain constant or increase