http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Survival/shltrall.html
BUILDING A SHELTER: The type of shelter you build will depend upon: the materials available, the
tools available, what you are sheltering from wind, cold, snow, rain, insects,
etc. How long do you intend to remain at the location? Snow caves and natural holes
are ideal if you are on the move and do not need a permanent structure. Size
will depend upon the number in the party!