It's a guideline to protect yourself/family/friends/whatever you want safe in the instance of nuclear fallout. A good plan is to do this for every door/window/whatever-that-isn't-airtight in the house and go hide in the bunker in your basement for up to around 50 years. Have fun!
Last edited by General Malarky; Mar 17th, 2015 at 06:27 AM.
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