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How to build a fast shelter in the wilderness
Look for natural shelter features.
Search in your immediate wilderness area for land features that could act as shelter. These will be the fastest forms of shelter you can make.
Caves or rock outcroppings that hang over your head are simple natural shelters. Build a fire in the entrance to a rock dwelling, to both smoke out any critters living in it and to warm rocks in the fire that you can then put around your body for warmth while sleeping.