Guidance on dealing with life-threatening hazards such as sleep deprivation, extreme terrain and severe frostbite.
The Sun
One of them had severe frostbite and all had been out overnight in temperatures well below freezing.
Times,Sunday Times
Rescue teams found him after three days - 30 miles from the crash site - with severe frostbite.
The Sun
Skin and tissue can freeze in seconds, causing severe frostbite.
Times, Sunday Times
He was taken to hospital with severe frostbite.
The Sun