Three of us spent a week underground in Deep Ecton in 1979; partly as a sponsored event for university 'Rag Week' and also to allow me to map the underground geology. We took a tent and campled in the main engine chamber. It was difficult to keep track of night and day so we used a Tilly Lamp as the Sun during the daytime.
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Our Campsite in the main engine chamber
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Steve and myself (in the background eating my helmet strap!)