A group of former military elites set out to explore an uncharted abyss, not knowing their worst nightmare is waiting for them deep beneath the ground.

记者金·沃尔在登上发明家彼得·马德森的潜艇后失踪。关于前者的命运，后者的说辞反复无常，而骇人的真相就掩藏其中。