In WW2 the treasures from the National Gallery were stored in an underground bunker for protection when bombs began to fall on London. This secret subterranean compound is 60 - 90 meters beneath the BREEDON GROUP COMMUNITY Welsh Slate quarries. Daniel Ashville Louisy investigates the bunker, history, millions of pounds of Plant and Machniery, the art of “Master Slate Splitting”, the production of slate products and the worlds fastest zip line, all while a train is being loaded with material dest