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MB3 175a: Minimizing Exertion Regarding Emptying a Storehouse on Shabbos (333:3); Saving Food on Shabbos from a Fire (334:1)
Emptying a wagon on Shabbos is prohibited even if it arrived on Friday (עובדא דחול, טירחא יתירא) except for what is needed.
Putting a fire out on Shabbos is permitted even if there is a remote chance it could be life-threatening. If it's not life-threatening, how much food can you save from the house?