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. A good shovel for this step should cost between $25-$50. As for length, "Nuclear War Survival Skills" calls for 11 feet for four people, and another three feet for each additional person. ![]() Step 1: Dig a trench three feet wide and five feet deep. ![]() Be prepared to do a lot of digging because it's ultimately the soil around and above you that could save your life.
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