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Steel: 0.7 feet Rock: 2-3 ft Concrete: 2.2 ft Wood: 8.8 ft Soil: 3.3 ft Ice: 6.6 ft Snow: 20-22 ft Plan on staying in your shelter for a minimum of 200 hours (8-9 days). If these materials are not at hand then use every bit of mass you can get to cover the top and sides of your shelter. ................
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