Rochester is famous for many things – but most visibly for the modest-sized castle in its town centre. Less visible, but of considerable fame to the subterranean community is the huge network of tunnels that runs almost from the castle to the edge of town.

This tunnel network under Rochester is nothing to do with the castle though – it is a modern network built during World War 2 as a joint air raid shelter and underground factory for the nearby aircraft manufacturers.

Thanks to my membership of SubBrit, I was able to join a small group on an officially sanctioned wander around the tunnels.


I say “officially sanctioned” as sadly the local teenagers have a habit of breaking in at times and playing havoc with the remains. Not only dangerous as the site is not at all visitor friendly, but infuriates the people living above ground who do not appreciate people climbing over their back gardens.

A recent incident where some kids decided to light a fire in the tunnels resulted in the fire brigade having to send teams in with breathing kit for four hours to secure the site and put the fire out. Ouch! For that reason, although we had full permission to take photos of everything and the place is not a total secret, entry was on the condition that we are a bit vague about where the main entrance is and not show any photos of the air vents etc lest it encourages more foolhardy locals to break in.

A bit of history

Shorts Brothers started off as an seaplane manufacturer on the Isle of Sheppy, but later moved to Rochester in 1913 due to the need for larger facilities. Here they expanded considerably over a 3.4 hectare site.

In 1936, they opened a factory in Belfast. During the Battle of Britain, the Rochester factory was heavily bombed by the Luftwaffe, which meant most of the manufacturing was then concentrated in Belfast.

However, the Rochester facility was still useful, and in 1941 they secured permission from the Ministry of Aircraft Production to build an underground factory next to their overground factories.

The tunnels were intended to create 12,000 square feet of workshop space at a cost of £20,000 which, it was acknowledged was somewhat higher than a new surface building but the stress was upon the vulnerability of the Medway estuary.

After the war, Shorts moved entirely to Belfast – where it still exists – and the underground tunnels were used by Blaw Knox as storage. The whole site above ground was cleared in the 1990s for housing development, and many of the tunnel entrances were blocked off.

The visit

Arriving in Rochester, I met up with the rest of the SubBrit team as we donned very necessary boiler suits and hard hats prior to walking to the official entrance – which is currently a rather nondescript door.

Inside we are initially in a series of conventional squared-off rooms, which turned out to be the medical centre. Underground changes to the structure include some modern drainage pipes and in a couple of the rooms we had to pass through, there are modern structural walls running across the rooms to hold up the housing above. There were small gaps in the walls to allow access to the deeper tunnel network.

Wait for me!

Now into the tunnels proper, these were the air raid shelters, so not huge in width/height. The tunnels were cut out of the chalk bedrock, so didn’t need the sort of tube-tunnel structures we need in London’s clays. The walls are lined with tiles, and the curved corrugated iron roof would have been familiar to anyone using an Anderson Shelter.

There is absolutely no lighting down here – so the only illumination came from our torches.


Running along all the tunnels were small alcoves – which were variously mens and ladies toilets. The lack of plumbing suggests they would have been chemical latrines, and the lack of door fitments suggests possibly just curtains for privacy.

Ladies toilets

There were also circles cut into the curved roof at regular intervals which caused considerable head-scratching. The consensus in our group was that they were recesses for light fitments – although the wiring would have to have been on the surface for access – but that is just an educated guess.

At various locations were the rusting remains of iron doors that blocked access to smaller side tunnels, which we presume would have been stores.

Rusting gates

There were also recessed boxes in regular locations, and the remaining wall decoration suggested these were cupboards holding first aid supplies.

The visit to the air raid tunnels was basically walking, looking, photographing – and repeat.

The air raid tunnel section is roughly 400 metres in length – with lots of side tunnels all over the place. Eventually though, we started to make our way from the air raid section of the tunnels to a solitary very long tunnel – that is also around 400 metres in length – that then takes you to the underground factory.

At various locations throughout the tunnel complex, later brickwork had blocked the tunnels – but holes of various sizes and comforts had been knocked through. Some were simple to walk through, some needed contortions and help to get through.


Into the factory at last, and here are a series of vast tunnels – that is around three stories in height at their centres.

The main factory tunnels

Here, I had a serious problem.

My long lasting lantern torch had failed to charge the day before, so I had taken my mid-life torch, which should last a good couple of hours, but had already died. I was now relying on my “floodlight” which I use for photography – but it doesn’t last long. Taking my leave of the group I decided to head back out before I got plunged into total darkness.

On the way back, I ran into more of the group, and was persuaded to return as a collection of ten handheld torches means I could see enough of the floor not to trip over the rubble, and my floodlight was kept to flashing at places and lighting up for photos. It just about survived until we left about an hour later.

I shall be holding a torch audit before my next subterranean adventure!

The factory tunnels, although cleared of most of their kit do still have some remnants left. Sadly most of these have been damaged by the kiddies and a lot has been lost. A filing cabinet that we found would be a treasure trove to aircraft historians as the area was scattered with paperwork and microfiche documents with plans and drawings.

As befits a factory floor, there were a couple of large air shafts to the surface in two side rooms, and air conditioning ducts ran around the roof. No photos of the air shafts as the owners are in a constant battle to stop people using them to get into the tunnels.

After a good wander around the huge tunnels, it was back into the narrow tunnels and time to head back – but not without exploring some of the side tunnels. Of particular note was a very deep water well in a side tunnel.

The water well

Despite doing nothing more than walking around and taking photos, we were down there for a good two and a half hours, which may give you an idea of the scale of the place. And we didn’t even see all of it! Below is a map of the tunnels – kindly supplied by SubBrit, and based on a survey by Kent Underground Research Group.

You can see the large factory on the right, the long single tunnel, then the very confusing complex of tunnels for the air raid shelter.

Another fascinating day – despite my serious torch panic – and public thanks to the organisers over at SubBrit.

If like me, you are interested in such tunnels, then I do strongly recommend joining SubBrit. The membership gets you a regular magazine, but you can then join the emailing list which is where a lot of the group visits are organised.

Membership is currently £18 per year.

Join here.

I took loads of photos – of which 69 seemed OK to publish. A few are a bit blurry, but included as they show interesting topics. The rest were either of restricted areas or failed in the darkness to come out.

Photos – details or slideshow.

I think this is my favourite photo of the whole set. Although it shows almost nothing of the tunnels, I like it. Lots.

Related blog posts you might like:

Pictures of the Digging of the Fleet Sewer

Visiting the “Battle of Britain” Underground Bunker


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  1. Cyndi says:


  2. Laura says:


  3. NelC says:


  4. Richard says:

    Very interesting. I was born in Rochester and grew up there in the sixties. I knew of the Shorts factories on the river and at Rochester Airport, but never knew about these tunnels. Fascinating. Thanks very much.

  5. Lewis Gale says:

    Who amazing is this? how can I find out more or possibly join???


  6. Andy Marsh says:

    I knew of these tunnels as they were bricked off when Lucas CAV took over the site, it was also documented but lovely to see the pics and inside finally, I would love to go down there myself and see it.

  7. Verity says:

    This is fascinating! I live above the tunnels (I think, not sure exactly as their location is a secret!)
    Might join SubBrit just to go in the tunnels!

  8. Andy Hoad says:

    Thank you a very interesting article. My father grew up in the Medway towns and for the first nine years of my life we lived in Frindsbury. We would often walk across the bridge to Rochester and dad would tell me about the Sunderlands taking off from the river and flying over the bridge.
    Your comment about the papers and micro fiche caught my eye, could someone possibly arrange for these to be extracted and looked at in case there is something of historical interest?

  9. Helen Whitewood says:

    These tunnels are causing alot of anti social behaviour right next where I live!! I’m seeing more and more youngsters hanging around outside my property looking for these tunnels! Why is nobody monitering this?! Surely it is very very dangerous not to mention the rubbish, debris, people hanging around at all hours and feeling unsafe near my own home! This has been going on since I moved in over a year ago and have only just found out what it is they’re all so interested in!

  10. Phil Watts says:


    Do you know who owns the tunnels and who ‘holds the keys’ so to speak?

    Is it Subterranean Britain?



  11. Heather says:

    I am totally blown away and grateful for this wonderful account. Both my mum and dad worked at Short Bros during the war….dad as a toolmaker working on the planes and mum in the red cross room.
    BUT neither ever mentioned the underground tunnels!!! and it’s too late now to ask them.
    I would LOVE to go down into them like you did when I come over to England next year and visit Rochester.

  12. d k brighton says:

    There are unexplained concrete slabs at the 2 sides of Backfields (Churchfields) and below Love Lane at the back of the small carpark on the Esplanade. Are they part of the tunnels?

  13. Elizabeth Beckhusen says:

    I lived at 15 Love Lane in Rochester in the early 70s. Our huge garden wall was said to be the Bishop’s Palace wall and at the base of it, on our side, we could see the top of a stone arch just cresting through the soil. We always thought it was something ancient that connected to the cathedral or castle. Bit of a disappointment to find out it’s not so old, but interesting to have an answer for it. Amazing it’s holding up so well – would hate to hear of a cave in.

  14. Peter JAMES says:

    Very interested I was born in Wales in 1941,and grew up with my grandparents. It was only a few years ago that I found out that my father worked at Shorts Rochester. I do remember a very little of a visit to Rochchester when I was about 2 years old.

  15. Pauline Roots says:

    I understood that these tunnels weren’t open to the public, and that was in the KM within the last year. I have always wanted to visited them as both my parents worked down there. My Dad Percy was a draughtsman and my Mum Hazel ran the Print Room from 1939 until 1943 which was unable to go below ground due to the flammable chemicals involved in Blue Printing. She showed King George V1 how they worked on his visit in early 1939. I have always longed to go down in the Tunnels and my brother had also. Unfortunately he has been dead several years now. I look forward to them being opened again. A Life time dream for me.

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