What was an ROC listening post ?
ROC listening posts were a network of over 1,500 small bunkers hidden all over over the country, first built during the Cold War. Each one was built about 15 miles away from the next one.. They would have been run by volunteers, who would measure nuclear blast waves and radiation in the event of a nuclear strike on the UK. The concrete in the roof provides protection from nuclear radiation. There's a good piece about them on the BBC News website.
This was the pipe that lead towards the surface that held the equipment that measured the nuclear blasts.
The entrance is quite small, so when I went down, my back was rubbing against the wall. The shaft is about 15 feet deep.
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