http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Survival/shltrall.html
BRION BED HUNTER TYPE 2: Also there is the old trapper trick : Dig a rectangular hole, fill it
with hot coals which you then cover up with earth then lay a blanket over it
all. It is the ideal to sleep warm, or: Where you place your bed, lite up a fire for
a few hours in order to dry up the ground and to heat it up.