Robert Williams is a warden of Dunsley fields who is out with his son Aidan, discovers a Sonic Ejection Platform (Hydro-Methane extractor) which is extracting methane gas illegally from under ground. When he and his son Aidan climb on board and report the abandoned machine, it begins to start operations and creates a cave in under the platform, trapping both Robert and his son inside the cabin beneath the machine. Robert is injured and get his son to call for help, Aidan manages to get in contact with Gordon and helps Gordon locate them by pinging Thunderbird 4 using a radio he built from parts his home made Thunderbird 3 model (Extraction).