3 HOURS WITHOUT SHELTER
Shelter Building
In extreme cold, wind, or rain, hypothermia can set in within 3 hours. Shelter is your first physical priority after air.
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Lean-To Shelter
Find a sturdy ridgepole — a long, straight branch or fallen tree — and prop one end on a support like a rock, stump, or forked tree at about waist height. Lay ribs (shorter branches) along both sides at a 45-degree angle. Cover the ribs with at least 3 inches of debris — leaves, pine needles, bark, moss — layering from the bottom up like shingles so water runs off. The steeper the angle, the better it sheds rain. Build it just big enough to fit inside to maximize heat retention.
Debris Shelter
A debris shelter is your best option when temperatures drop and you have no gear. Create a ridgepole just long enough for your body, propped up about 2 feet high at the entrance. Lean sticks along both sides and pile debris — leaves, pine needles, grass — at least 2 to 3 feet deep over the entire structure. The smaller the interior, the more effectively your body heat warms the space. Stuff the inside with dry leaves or grass for ground insulation. This shelter can keep you alive in near-freezing conditions.
Snow Shelter (Quinzhee)
Pile snow into a large mound at least 6 to 8 feet wide and 4 to 5 feet high. Let the pile sinter (settle and bond) for at least 2 hours — this is critical for structural integrity. Insert sticks about 12 inches deep around the mound as thickness guides. Hollow out the interior from one side, stopping when you hit the stick tips. Create a small ventilation hole in the top. The entrance should be lower than the sleeping platform inside so cold air sinks out. A quinzhee stays around 32°F inside regardless of outside temperature.
Heat Retention Principles
The ground will steal your heat faster than the air. Always insulate from below first — pile leaves, pine boughs, or grass at least 4 inches thick as a sleeping pad. Keep your shelter as small as possible — a tight space retains body heat far better than a large one. Block wind from the entrance with a backpack, debris wall, or fire reflector. If you have a fire, build a reflector wall of stacked logs behind it to bounce heat toward your shelter opening.