By 2045, humans have built weather machines to control the warming climate due to climate change and global warming.
The machines break down when one day it begins to snow and doesn’t stop.
Whatever humans remain live in underground bunkers to escape the extreme cold.
Their challenges are controlling disease and producing sufficient food.
Two soldiers, Briggs (Laurence Fishburne) and Mason (Bill Paxton) are the leaders of one such bunker, Colony 7.
Briggs, Sam and Graydon travel to nearby Colony 5 after receiving a distress signal. Briggs leaves Sam’s lover Kai in charge of the colony while he’s gone, much to Mason’s chagrin.
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Upon arrival, they find Colony 5 covered in blood.
They eventually reach a locked door which Sam picks open.
Inside they find Leland, who shows them a message they received from another group of people who fixed a weather machine and have caused the snow to thaw.
The group offers aid to anyone and asks that they bring seeds so they can be planted in the newly thawed permafrost soil.
Leland shows them where the signal came from, but informs them that an expedition failed to find the source of the transmission.
Moreover, the expedition’s tracks led a marauding group of cannibals back to Colony 5, and the killing ensued.
Briggs, Sam, and Graydon try to force Leland to return with them, but he locks himself back into his room.