Thunderbirds Are Go Episode 19 Extraction Episode Title:Extraction.Episode Description:Seismologist Robert Williams and his son Aidan alert the authorities to the presence of a rogue hydromethane mining vehicle, only for the machinery to trigger an earthquake that swallows both them and the equipment. Gordon must attempt a daring underground rescue of the boy and his injured father while Virgil must find a way to shut down the out-of-control rig.