This is a video a snowmobiler avalanche burial that occurs in a creek bed feature near Valemount BC. Luckily his buddy is right there to pull him out. It’s a good video to understand terrain and how easily a small event can turn into a big deal. The video shows how easily an airway can get clogged by snow, especially with a full face helmet on. The snow let go on a buried surface hoar layer. While these guys are just sledding, terrain features like this are often encountered by sled skiers and boarders.