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Fallout shelter plans10/18/2023 Underground Bunker Plans #1 Septic Tank DesignĪ concrete septic tank makes a sturdy base for a basic underground shelter and is cheap and comparatively quick to install.Īround 20% of all the homes in the US already have a septic tank installed, but that doesn’t help. There aren’t a lot of underground bunker plans available for free, but you can get some useful ideas from companies manufacturing bunkers or using the plans for old bomb shelters and root cellars as a basis for your design. Designing and building your own is a cheaper option and one you can achieve relatively easily, provided you can come up with some viable plans. If you purchase these poles, instead of chopping them down yourself, you're looking at an average cost of about $20 per log, or $400 for 20 logs.As climate change and global unrest promise more local and global catastrophes so, more people are considering having a subterranean world to escape to.Īlthough you can buy ready-made underground bunkers, these are often prohibitively expensive. The poles should over-hang the edges by at least a foot in order to help support the soil on top. Step 4: Once you've dug your trench, lay your wooden poles over top of it. A basic 3-by-11 foot waterproof tarp should run you between $20-$40. Step 3: When completed, place waterproof material over each end of the shelter to form an overhead canopy - this should keep your shelter dry as well as catch any dropping fallout. It should be about two feet wide by three and a half feet deep - it's basically a crawl space and can double as an emergency exit for smaller individuals. Dig this trench just under the ground's surface with an opening to the surface at the end of it. At the other end of the trench, dig a five-foot-long ventilation trench to help circulate air. Step 2: Next, dig a five-foot-long entrance with steps or a slope down into the main area. Account icon An icon in the shape of a person's head and shoulders.
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