Mysteries of the Abandoned

Factory of Death (7x5)

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A deserted facility in the remote countryside features mysterious graffiti that may be highly advanced mathematical equations pointing to a dark secret; experts investigate this classified military wasteland with a deadly past. Stories: 1) MS Factory, Rhydymwyn, Wales; 2) Manoel Island, Malta; 3) Austin Dam, Freeman Run Valley, PA; 4) Stalin's Subway, Kiev, Ukraine