Fan Bay Deep Shelter is a network of Second World War tunnels dug 23 metres (75 feet) into the White Cliffs of Dover in Kent, built in 1940–41 to shelter the soldiers manning the Fan Bay gun battery above. Buried in the 1970s and reopened by the National Trust in 2015, it can be visited only on a guided hard-hat tour, which also takes in two sound mirrors, the first of them built during the First World War. Tours normally run Friday to Monday from 11am, and the entrance is about a 40-minute clifftop walk from the White Cliffs of Dover visitor centre.
- History of Fan Bay Deep Shelter
- Visiting Fan Bay Deep Shelter: Practical Information
- Frequently Asked Questions
- Nearby Chronicle Trails Guides
History of Fan Bay Deep Shelter
Fan Bay Battery and Churchill’s 1940 Order
Fan Bay Battery, the gun site the deep shelter was built to serve, traces its origins to the summer of 1940. The National Trust’s history of the battery explains that after the Dunkirk evacuation both sides saw the need to control the Dover Strait with heavy artillery, and that on 28 August 1940 Winston Churchill wrote to his military chiefs insisting that Britain hold superior gun positions on the Dover promontory. According to the Trust, that instruction started the largest and fastest increase in coastal artillery ever seen in the UK.
Seven new battery sites were proposed in early September 1940. The one then called Fan Hole was given priority and ordered into construction in late September, with ground works starting in October. The National Trust records that, despite a very wet and cold winter, its three 6-inch guns were in position and being proof-tested by mid-February 1941.
Fan Bay Deep Shelter Construction, 1940–41
Fan Bay Deep Shelter was dug to protect the gun crews from enemy shellfire and air attack. The National Trust states that it was designed to hold 154 men in tunnels 23 metres (75 feet) underground, reached by a three-flight staircase of 125 steps, with two emergency exits built beside the old sound mirrors.
Men of 172 Tunnelling Company, Royal Engineers, began mining on 20 November 1940 with hand-held pneumatic drills, picks and shovels. The Trust explains that they lined the tunnels with heavy corrugated iron supported on steel colliery arches, a technique used in the nearby Kent coal mines. The shelter was completed by 28 February 1941, the month 203 Coast Battery, Royal Artillery, began manning the site. A serious condensation problem later forced the soldiers out of the sleeping tunnels until a powered ventilation plant was installed in the winter of 1941–42.
Fan Bay Sound Mirrors
The Fan Bay sound mirrors are more than 20 years older than the shelter. The National Trust dates the first to 1916–17 and the second to around 1920. Each is a curved concrete dish that concentrated the sound of approaching aircraft engines into a collector, where a trained operator listened through a stethoscope to estimate an incoming raid’s height and bearing.
The Trust records that the northern mirror appears in First World War diaries detecting an incoming air raid, and that lives were reportedly saved in the Dover and Folkestone area in 1917. Radar replaced sound mirrors in the late 1930s, and by 1940 the Fan Bay mirrors were redundant, so the Royal Engineers used them as a starting point for drilling the shelter, damaging the inland mirror in the process.
Fan Bay Battery in Action, 1942–1944
Fan Bay Battery was renamed from Fan Hole during 1942. The National Trust gives its guns a range of about 14 miles (22.4 km) and notes they were sometimes used as “flashing batteries”: fired with a full charge and solid shot to create a large muzzle flash, meant to make German ships change course into the range of bigger guns.
The war diaries of 540 Coast Regiment, quoted by the Trust, show the Fan Bay guns in use on at least 17 occasions between 1942 and their last action in September 1944. By the autumn of 1944 Canadian troops had captured the German coastal batteries across the Channel, and Fan Bay ceased firing.
Operation Eyesore and the Burial of Fan Bay
Operation Eyesore, a government clean-up scheme proposed in 1970, is the reason the shelter disappeared for four decades. The National Trust explains that the guns were test-fired until 1950, the site was disused by 1957, and it was guarded through the 1960s while explorers still found their way into the tunnels.
Operation Eyesore offered grants to clear wartime relics from beauty spots such as the White Cliffs. Kent County Council took up the grant, and in late 1972 the gun emplacements and the shelter’s surface buildings were levelled, with the rubble pushed into the gun pits and the shelter staircase. In 1975 hundreds of tonnes of soil and chalk were bulldozed over the slope to bury the sound mirrors and the emergency exits.
National Trust Rediscovery and Reopening
The National Trust bought the clifftop between Langdon and South Foreland Lighthouse in 2012. Volunteers began clearing the staircase in the winter of 2013–14, found the buried sound mirrors under about a metre of soil in May 2014, and removed more than 600 tonnes of spoil to uncover them and the emergency exits.
Fan Bay Deep Shelter opened to the public on 20 July 2015, after a £117,000 project and more than 3,500 volunteer hours. The Trust bought the neighbouring gun sites in 2017, and Fan Bay No. 3 gun emplacement, excavated in July 2023, opened to visitors on 20 June 2025 as part of the same visit.
Visiting Fan Bay Deep Shelter: Practical Information
Managing body: The National Trust, a UK conservation charity, which also runs the White Cliffs of Dover visitor centre and South Foreland Lighthouse.
Address: Langdon Cliffs, Upper Road, Dover, Kent CT16 1HJ. This is the White Cliffs of Dover car park and visitor centre; the shelter itself is a walk away along the cliffs.
Opening hours: Normally open from 11am on Fridays, Saturdays, Sundays and Mondays. Opening dates vary through the year, so check the National Trust calendar for your date before travelling.
Tour times: Guided tours of the deep shelter start every 30 minutes, on the hour and half hour, from 11am. The last tour leaves at 3pm.
Ticket prices: Adult (18+) £15; child (5–17) £7; under-5s free. No concession (reduced-price) rate is listed. National Trust members tour free with a valid membership card.
Booking: Places cannot be reserved in advance. Tickets are sold at the shelter on a first-come, first-served basis, and you are given a tour time when you arrive. You can pay by cash or card.
Getting there from London: Southeastern high-speed trains run direct from London St Pancras International to Dover Priory in around 1 hour 15 minutes, with no change needed. Slower services run from London Victoria and London Charing Cross.
From Dover Priory station: The White Cliffs of Dover visitor centre is about 2 miles away, roughly a 40-minute walk following brown signs. Taxis wait outside the station.
From the visitor centre: The shelter is about a 40-minute clifftop walk. There is no vehicle access. When the additional parking area is open (signed at the main entrance), it is about 15 minutes’ walk from the shelter.
Parking: £6 per car at the White Cliffs of Dover car park. National Trust members and Blue Badge holders (the UK’s disabled parking permit) park free. The gates lock at 7pm, and a £50 release fee applies after that.
How long to allow: About 90 minutes at Fan Bay: a guided shelter tour of around 60 minutes and a self-guided visit to the No. 3 gun emplacement of around 20 minutes. Add the walk each way.
Accessibility: The tour uses the original staircase of 125 concrete steps, 23 metres down and back up, with a handrail and floor-level lighting. The tunnels are unlit apart from head torches, cool and damp at about 12°C, and slippery in places, with some crouching near the sound mirrors. The full AccessAble guide has more detail.
Children: The National Trust advises a minimum age of 8. Babies and small children cannot be carried on the staircase. Child-sized hard hats and head torches are available.
Dogs: Assistance dogs only in the tunnels. Water bowls for dogs are provided at the shelter.
Facilities: No toilets or catering at the shelter. Use the visitor centre or South Foreland Lighthouse before you set out.
What to wear: Sensible closed-toe shoes; no flip-flops, sandals or high heels. Hard hats and head torches are provided.
Nearby attractions: South Foreland Lighthouse, a Victorian lighthouse about half a mile (1 km) away; the White Cliffs of Dover visitor centre and clifftop paths; and Dover Castle, about 1.25 miles from the visitor centre on a signed trail.
Prices last checked: October 2026
Opening hours last checked: October 2026
Sources: the National Trust’s Fan Bay Deep Shelter visitor page, its White Cliffs of Dover page for prices, opening dates and directions, and its brief history of Fan Bay Battery. Rail times are from Southeastern.
Where to book: No advance booking is available. Buy tickets on the day at the shelter entrance, and check the opening dates on the National Trust White Cliffs of Dover page before you travel.
Frequently Asked Questions
Fan Bay Deep Shelter tickets cost £15 for adults (18+) and £7 for children aged 5 to 17, and under-5s go free. National Trust members tour free with a valid card, and the ticket includes the self-guided visit to the No. 3 gun emplacement.
No, Fan Bay Deep Shelter tours cannot be booked in advance. Tickets are sold at the shelter on a first-come, first-served basis, and you are given a tour time on arrival.
Fan Bay Deep Shelter normally opens from 11am on Fridays, Saturdays, Sundays and Mondays, with tours every 30 minutes and the last at 3pm. Opening dates vary through the year, so check the National Trust calendar before you travel.
Yes, Fan Bay Deep Shelter works as a day trip from London. Direct high-speed trains from St Pancras reach Dover Priory in around 1 hour 15 minutes, then it is about a 40-minute walk or short taxi ride to the White Cliffs visitor centre and a further 40-minute clifftop walk to the shelter.
Park at the National Trust White Cliffs of Dover car park at Langdon, postcode CT16 1HJ, which costs £6 per car. There is no vehicle access to the shelter itself, which is about a 40-minute walk away, or 15 minutes from the additional parking area when it is open.
Not quite. The National Trust says the tunnels’ presence was already known when it bought the land in 2012, because erosion had opened a hole at the top of the staircase; what was unknown was whether the buried sound mirrors had survived.
Nobody knows exactly how many ships the Fan Bay guns sank. The National Trust explains that the battery’s diary has few details, and the often-quoted figure of 28 ships sunk covers all the guns of 540 Coast Regiment, not Fan Bay alone.
Nearby Chronicle Trails Guides
Fan Bay pairs naturally with Dover Castle, whose own wartime tunnels directed the Dunkirk evacuation, a signed walk from the White Cliffs visitor centre. Canterbury Cathedral is an easy stop on the way back towards London. Browse more Castles & Historic Attractions guides, or explore the England hub.
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