The once top-secret abandoned bomb facility hidden in an old slate mine. Step inside the subterranean labyrinth of Llanberis Bomb Store, Wales.
In the 1930s the slate quarry became a vast RAF munitions store.
In January 1942, the roof collapsed burying 14,000 tonnes of bombs (14% of Britain's stock). It took until the 1970s to fully clear the site of bombs.
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