When an earthquake hits, Mackenzie and two of his co-workers are forced to take shelter in a refuge chamber three miles below ground, uncertain of the damage around and above them. Weighing their options, the three must decide whether to stay put or take their chances climbing to the surface, though making it to ground level is just half of the battle.
Max and Lorenzo are strangers who have crossed paths under the most dire of circumstances – the need to survive. With the earth nothing more than a wasteland and solar radiation a constant threat, the two of them set out for a place called Hope Cavern, an underground city where people have taken refuge. Making the journey north, however, they realize there is a price to pay for companionship.
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