A deep snow or tree well accident occurs when a rider or skier falls into an area of deep unconsolidated snow and becomes immobilized. The more the person struggles the more entrapped in the snow they become.
If a partner is not there for immediate rescue, the skier or rider may die very quickly from suffocation - in many cases, they can die as quickly as someone can drown in water.
Deaths resulting from these kinds of accidents are referred to as a NARSID or Non-Avalanche Related Snow Immersion Death.
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