I did it one year. Four hardwood skids made the cave and then snow on top. Safe. Burnt the skids in the spring and then used a magnet to pull pounds of nails out of the firepit. Never again. Too much work. Just a pile with no core since.For any parents with kids building snow tunnels please be Extremely careful and monitor that activity. Co worker lost his son when a driveway sno fort tunnel collapsed. The father never recovered mentally either .
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