Snow Formation and Avalanches : Page 222
If there are a large number of survivors, it may be desirable to send one or two for additional help, but if the number of survivors is small and help is some distance away, they should search for at least an hour before going for assistance. The site of an accident should never be left without first carefully marking the place with markers that will not be obliterated by a storm.
Victims will rarely survive very long in a wet-snow avalanche, and may have been crushed immediately by large blocks in a wind-slab avalanche; however, men have been known to survive for days when buried in light dry snow.