I gave my avalanche thoughts about 30 posts ago
. Maybe if he had an inflatable
Ice. I don't remember how Stallone escaped the frozen water in Cliffhanger, perhaps he blasted his way out like in Never Cry Wolf. How about a frozen lake which is revealed to have no water beneath, just a long drop to the rocky ground? I've actually heard of this phenomenon: a reservoir is built and filled with water, trees in the former valley are topped at water level, the surface freezes, and rests on the many treetops when the reservoir is drained. Sequoias would be too far apart, but 100 foot lodgepole pines are plausible. When it starts to collapse and tilt at odd angles, the chase and escape (on aerosani and snowmobile) up the long valley begins.