A series of secret tunnels, built behind the famous White Cliffs of Dover on the orders of former British PM Winston Churchill, have opened to the public for the first time.

More than 50 volunteers along with archaeologists, engineers, mine consultants and a geologist, spent two years excavating and restoring the tunnels which, known as the Fan Bay Deep Shelter, were aimed at housing men manning gun batteries designed to prevent German ships from moving freely in the English Channel.

The shelter, which was personally inspected by Churchill in June, 1941, provided accommodation for four officers and up to 185 men in five bomb-proof chambers for use during bombardments as well as a hospital and a store room. It was originally dug by Royal Engineers from the 172nd Tunnelling Company in just 100 days.

The tunnels, which were decommissioned in the 1950s and then filled in during the 1970s, were discovered after the National Trust bought the land above in 2012. More than 100 tonnes of soil and rubble were removed during the excavation.

Specialist guides now take visitors on 45 minute, torch-lit, hard hat tours into the shelter – the largest of its kind in Dover, taking visitors down the original 125 steps into the tunnels 23 metres below the surface. Inside can be seen graffiti dating from the war which includes the names of men stationed there as well as ditties and drawings. Other personal mementoes include homemade wire hooks, a needle and thread and ammunition.

Back above ground, there are two World War I sound mirrors which were originally designed to give advance warning of approaching aircraft but which had become obsolete when radar technology was invented in 1935 (pictured in action below).

The tunnels complement those which are already open at Dover Castle (managed by English Heritage).

WHERE: Fan Bay Deep Shelter, Langdon Cliffs, Upper Road, Dover (nearest train station is Dover Priory (two miles); WHEN: Guided tours only – from 9.30am daily until 6th September – tours then on weekdays only until 30th September); COST:£10 adults/£5 children (aged 12-16) (free for National Trust members); WEBSITE: www.nationaltrust.org.uk/white-cliffs-dover. 

 PICTURE: Top – National Trust/Barry Stewart/; Bottom – National Trust/Crown Copyright.