A "snow cave" is a shelter made by building a small room using snow as walls and a roof. It is used to protect people from the cold weather and keep them safe while they are outdoors. Full definition
Ice seals, one of the primary diets of polar bears, give birth in snow caves dug in sea ice during late springs. (natureworldnews.com)
In the lee of a hillside on the least slide - prone slopewe can find in the dark, we dig a shallow snow cave and crawl in. (si.com)
I like to believe that they were exceptionally well designed, architecturally sound, play structures, never mind the possibility of broken bones or being buried in a snow cave! (seasonalandsavory.com)