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Ok- that one is pretty darn amazing. I thought for sure I'd seen this before when I saw the link earlier today- but I was thinking about the big rubber bladder they inflate and then pour concrete over. That one makes structures the size of aircraft hangars. But requires constant attention until the concrete has set.
Heck, add a chimney to it and you've got an all weather shelter!
Right? I could live in that. I saw another vid where they said after it hardens cover it with earth for small arms and fragmentation resistance. All I could think was "I gotta have one"