Picture of Snow Survival Shelter [must have deep Snow]
I can show you how to make a safe Snow Shelter with two store bought tools, some twigs, and a lot of Snow.Once I picked a good spot it took me 60 minutes to complete.
A Saw and a Shovel were purchased then used for this.
This Instructables Shelter is based on a real life Survival Shelter and is a re-creation. A few tree branches were harmed in the making of this re-creation Shelter discretion is advised.
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Step 1: Snow required

Picture of Snow required
 I searched for a snow drift where nothing could fall  from above and bury me.
The Saw was used to cut some Willow branches then brought to the shelter site.I cut enough to make about 20 sticks to use for proper thickness in the walls.All sticks were about a Foot and a Half or so long but all about the same length.This is how thick your walls will be,as long as your sticks are.

Step 2: Don't Dig It yet?

Picture of Don't Dig It yet?
The branches are placed in the snow from the outside pointing inside so when you dig from inside you can't dig too thin of walls.I placed these every 2 or 3 feet apart pointing into the place I will dig covering about 7 or 8 ft. wide on the outside, in a dome shape covering the front,top and back sides..The Entrance needs to be on the side with the least wind.
So I have:
Cut branches
Found a safe suitable location
Placed the equal length Twigs from outside pointing in every 2 or 3 Feet
Decided where the Entrance should be
Now I can start digging.

The way to stop CO2 building up is to dig a step as your entrance to the snow hole. CO2 is heavier than air, so by digging a step out of your shelter (and leaving a gap above any "door" you might make out of snow) then you will get "clean" air circulating through your shelter. To reduce avalanche risk the snow hole should be built against a face of some form. Often snow will build up on the lea side of an obstacle like this, but such snow is not usually stable enough, although with caution, it can be used in emergencies.
Ketzer3 years ago
You exhale carbon dioxide. The only way you'll get carbon monoxide in your shelter is if you are using a stove, heater, or gas-powered device. (or you are downwind of car or generator exhaust)

Carbon dioxide will still kill you, but carbon monoxide will do it much quicker.