http://gizmodo.com/5366887/pov-helmet-cam-captures-skier-causing-avalanche-getting-buried-and-getting-rescued


When the avalanche comes to a stop, the flowing snow forms a glove-like cast around your body. While you can still breath in small panting gasps, the snow packed around your face quickly saturates with poisonous carbon dioxide, and soon after melts and re-freezes into an ice mask that cuts off your air as effectively as a plastic bag. Respiratory arrest quickly ensues, with cardiac arrest and death soon after.