Date Aired:
Dec 04, 2015 (United Kingdom), Nov 03, 2016 (United States)
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Robert Williams, a seismologist, and his son Aidan alert the authorities to the presence of a rogue wildcat mining operation, only for the machinery to trigger an earthquake that swallows the equipment - along with them both. Gordon must attempt a daring underground rescue of the boy and his injured father while Virgil has to find a way to shut down the out-of-control rig.