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perfect belly glide on the ice up north. Temp in the deep frost category. Say -20 or -30 F. It would easily be half a day to a full day before someone got up there. What would be the key techniques to staying alive in a fully equipped 777? I am gonna assume they have lost all power.

Since the plane is intact, there's lots of warmer clothing in the luggage compartment. However, belly landing on ice? will probably rip the aircraft apart before it stops, but it's your scenario.

First thing I'd do is try to restart the APU.
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Okay, what’s your point??