

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.
