This is truly terrifying stuff. This group of amateur backcountry skiers had to rescue a member of their team who fell into a tree well.

Tree wells usually form after a big dump of snow. Low hanging branches prevent snow from collecting around the base of an evergreen tree, creating a hollow space.

"90 per cent of people who fall into tree wells are unable to get themselves out"

90 per cent of people who fall into tree wells are totally unable to get themselves out. They are usually wedged head first underneath the snow.

Roughly four people die from snow immersion suffocation in the USA every year. Many more become trapped and luckily are rescued - like the guy in the video above.

If you're heading to the mountains this winter, make sure you know how to rescue a friend who is stuck in a tree well by reading this safety advice.

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