http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Survival/shltrall.html
WHAT IS UNDERNEATH IS MORE IMPORTANT THAN WHAT'S OVER YOU. Dig tunnel into snow if no other shelter is available. Use stick to keep air
vent open. In deep snow, base of trees can provide shelter. Use your imagination, improvise but KEEP CONSTRUCTION SHELTER SIMPLE, DON'T
WAIST VALUABLE ENERGY!