Soviet Nuclear Bunkers in the Czech Republic

History – In brief

After the end of WWII and the collapse of the Third Reich, the territory now belonging to the Czech Republic fell on the Soviet side of the Iron Curtain. Together with today’s Slovakia, it formed the now disappeared unitary state of Czechoslovakia. Despite laying right on the border with the West – including Bavaria, which was part of West Germany and NATO – communist Czechoslovakia enjoyed a relative autonomy from the USSR, until the announced liberally-oriented reforms of the local communist leader Dubcek in the spring of 1968 triggered a violent reaction by the Soviet leader of the time, Leonid Brezhnev (see here). About 250’000 troops from the Warsaw Pact, including the USSR, landed in the Country. As a result, the Soviets established a more hardcore and USSR-compliant local communist regime, and largely increased their military presence.

Similar to the German Democratic Republic (see here for instance), Hungary (see here) or Poland (see here), since then also in Czechoslovakia the local national Army was flanked by a significant contingent of Soviet troops, who left only after the entire Soviet-fueled communist empire started to crumble, at the beginning of the 1990s.

Consequently, for the last two decades of the Cold War, Czechoslovakia was a highly militarized country similar to other ones in the Warsaw Pact (see here). Its geographical position on the border with the West meant it received supply for a high-technology anti-aircraft barrier (see here). Two major airbases in Czechoslovakia were taken over for use by the Soviets and strongly potentiated (see here).

Soviet Nuclear Depots in Czechoslovakia

Beside conventional forces, also nuclear warheads were part of the arsenal deployed in this Country. Where in the late 1960s Soviet strategic nuclear forces were already mostly based on submarine-launched missiles and ICBMs ground-launched from within the USSR’s borders, tactical forces were forward-deployed to satellite countries, to be readily operative in case of war in Europe. Missile systems like the SCUD, Luna (NATO: Frog) and Tochka (NATO: Scarab) were deployed to the Warsaw Pact, supplying either the local Armies or the Soviet forces on site. Typically armed with conventional warheads, these systems were compatible with nuclear warheads too, making them more versatile, and of great use in case of a war against NATO forces in central and western Europe (see here).

Irrespective of their employment by a local national Army or a Soviet missile force, nuclear warheads were kept separated from the rest of the missile system for security, and invariably under strict and exclusive Soviet control. Bunker sites were purpose built in all components of the Warsaw Pact for storing nuclear warheads – see page 46 of this CIA document, showing with some accuracy the location of the corresponding bases.

Granit– and Basalt-type bunkers were typically prepared on airfields or artillery bases, for short-term storage of soon-to-be-launched nuclear weapons. Instead, top-security Monolith-type bunkers (the triangles on the map in the CIA document) were intended for long-term storage of nuclear ordnance.

Monolith-type bunkers were built by local companies on a standard design in the Soviet military inventory, and were implemented in satellite Countries in the late 1960s. Czechoslovakia received three such sites, which took the names Javor 50, by the town of Bílina, Javor 51, close to Míšov, and Javor 52, close to the town of Bělá pod Bezdězem. All three locations are in the north-western regions of today’s Czech Republic.

The Soviet military started withdrawing the nuclear warheads from satellite Countries in 1989, months before the collapse of the wall in Berlin. As for Czechoslovakia, by 1990 all nuclear forces had been moved back to the USSR. Following the end of the Cold War, Monolith-bunkers – similar to most of the colossal inventory of forward-deployed military installations formerly set up by the Soviet Union – were declared surplus by the Countries where they had been implemented.

These primary relics of the Cold War have known since then different destinies. Some of them have been hastily demolished, and together with their associated fragments of recent history, they have almost completely disappeared into oblivion. Luckily, a few are currently still in private hands, and still in existence (see here and here) – specimens of recent military technology, and a vivid memento from recent history, when the map of Europe looked very different from now. Two can be visited, of which one is Javor 51, in the Czech Republic, the main topic of this post. This has been turned into the ‘Atom Museum’, which has the distinction of being the only Monolith-type site in the world offering visits on a regular schedule (the other open site is Podborsko, in Poland, covered here, which is open by appointment).

Also displayed in the following are some pictures of the now inaccessible site Javor 52 in former Czechoslovakia. Photographs were taken in 2020 (Javor 52) and 2022 (Javor 51).

Sights

Javor 51 – The Atom Museum, Míšov

An exceptionally well preserved and high-profile witness of the Cold War, the nuclear depot Javor 51 is a good example of a Monolith-type installation. These bases were centered around two identical semi-interred bunkers for nuclear warheads.

When starting a visit, you will soon make your way to the unloading platform of bunker Nr.1. The shape of the metal canopy, and the small control booth with glass windows overlooking the platform are pretty unique to this site. The metal wall fencing the unloading area is still in its camo coat outside, and greenish paint inside. Caution writings in Russian are still clearly visible. Concrete slabs clearly bear the date of manufacture – 1968. This site was reportedly activated on the 26th of December, 1968.

Even the lamps look original. Some of the – likely – tons of material left by the Soviets on the premises of this site has been put on display ahead of the massive bunker door.

The opening mechanism of the latter is a nice work of mechanics. Four plugs actually lock or unlock the door. They can be moved by means of a manual crank, or likely in the past via an electric mechanism (some wiring is still visible). The thickness of the doors is really impressive (look for the cap of my wide lens on the ground in a picture below for comparison!).

Each bunker had two ground-level entrances to the opposite ends, each with two blast-proof doors in a sequence. Warheads were transported by truck, unloaded beside the entrance of one of the two bunkers, and carried inside through the two doors, which constituted an air-tight airlock.

Today, you can see the inside main hall of the bunkers from the outside during a visit. This was likely not the case in the days of operation. The opening procedure required a request signal to travel all the way to Moscow, and a trigger signal traveling in the opposite direction. Once past the first (external) door with the warhead trolley, that door was shut, and the procedure was repeated for the second door, giving access to the inside of the bunker.

A security trigger told Moscow when the door was open. It can still be seen hanging from top of the door frame.

Once inside, you find yourself on a suspended concrete platform. The warhead trolley had to be lowered via a crane – still in place – to the bottom of the cellar ahead, i.e. to the underground level. The stairs now greatly facilitating visitor’s motion around the bunker were not in place back then, and descending to the underground level for the technicians was via a hatch in the floor of the suspended platform, and a ladder close to the side wall.

On the platform, an original Soviet-made air conditioning system can be seen – with original labeling – and signs in Russian are on display on the walls.

The platform is also a vantage point to see the extensive array of heat-exchangers put along a sidewall of the central hall – atmosphere control was of primary importance for the relatively delicate nuclear warheads. Each of them traveled and was kept in a pressurized canister. However, also the storage site was under careful atmospheric control.

To the opposite end of the bunker, the inner tight door of the second entrance can be clearly seen, ahead of another suspended platform. The warheads left the bunker for maintenance (they might have left also for use, but this never happened, except possibly on drills) from that entrance, which had a loading platform outside for putting the warheads on trucks (this can be better seen in other Monolith sites, like Urkut in Hungary, or Stolzenhain in Germany).

Down on the lower level, the main bunker hall gives access to one side to four big cellars, where the warheads spent their time in storage, and to the other sides to technical rooms. The pavement in the storage cellars features the original metal strongpoints, used to anchor the trolleys for the warheads to the ground. This was in case of a shockwave investing the site in an attack, to avoid the trolleys moving and crashing against one another. The original hooks with spherical joints to link the trolley to the strongpoints are also on display.

The storage cellars today have been used to display informative panels, with many interesting pictures and schemes. These include some from major sites connected with the history of nuclear weaponry in the Soviet Union (like from the test site of Semipalatinsk) and the US (like the Titan Museum near Tucson, AZ, covered in this post).

A few former technical rooms are used to store much original technical gear. This ranges from spare parts, tools and personal gear like working suits left by the Soviets (most with signs in Russian), to items ‘Made in Czechoslovakia’ or even radiation detectors from Britain and the West, gathered here for display and comparison.

Some of these spare parts are wrapped and sealed in Russian, looking like they were cataloged back in the time of operations.

In the main hall, many rare vintage pictures retrace the presence of Soviet military forces on this site as well as others in Czechoslovakia. Magnified copies of rare pictures portray the trucks, canisters and the very warheads likely involved in transport and storage in Javor 51. Actually, much mystery exists around the deployment of nuclear ordnance by the USSR outside its borders (not only to Czechoslovakia). Historical and technical information today made available, even to a dedicated public, is very limited, making this chapter of Cold War history even more intriguing.

Again in the central hall, cabinets for monitoring the nuclear warheads can be seen hanging from the walls, painted in blue. Each warhead used to be stored in a canister, which was periodically linked to these cabinets to check the inner atmosphere, temperature, etc., in order to monitor the health of its very sensitive content.

A large part of the technical/living rooms has been preserved in its original appearance. You can see parts of an air conditioning system, a big water tank, a toilet, a now empty bedroom for the troops. The bunker was constantly manned inside by typically six people, who operated in shifts. They did not sleep there, nor used the toilet much due to poor drainage. However, these facilities were used in drills, and were intended for the case of real war operations, when the bunker might have been sealed from the outside.

The electric cabinets take a dedicated room, like the huge air filters and pumps (Soviet made), installed to grant survival of the people inside the bunker in case of an attack with nuclear weapons or other special warfare. Clearly, the level of safety in the design of the bunker stemmed from the fact that it was considered by the Soviet as a a strategic target for NATO forces.

The last technical rooms host a big Diesel generator, supplied with air from the outside, and a big fuel tank in an adjoining room. Many labels bear writings in Russian, but the generator appears to be made in Czechoslovakia. The bunker was linked to the usual electric power grid of the region, and the generator was intended for emergency operations, in case the grid was lost or the bunker was isolated.

From the technical area, it was possible to access or exit the bunker, via a human-size airlock. The innermost tight door can be seen painted in yellow, with a locking mechanism resembling that of the major tight doors for the missile warheads. Outside the airlock, climbing three levels of ladders was required to get to the surface. This was the normal access to the bunker for the military technical staff, except when warheads arrived or left the storage (this was made via the major entrances, as explained).

Back outside, the second bunker, Nr.2, can be found at a short distance from the former. Nr.2 is being prepared for an exhibition on technology. At the time of writing, it can be toured except for the technical/living rooms. It is in a very good condition, and allows to get similar details as the previous Nr.1 on the construction of this type of facility – including the heating/air conditioning system.

The blue cabinets for plugging the canister for routine status checking and maintenance can be found also in Nr.2 in good shape.

Clearly visible here are the doors closing the technical areas and the warhead cellars. The latter were monitored for security just like the external airtight doors of the bunker, each with a sensor telling controllers whether the cellar was locked or not.

The airlock is covered in soot, possibly the result of a fire. Ahead of the entrance, the unloading platform is very interesting, having a unique set of light doors which had to be opened to allow trucks to come in. The concrete part of the platform appears slightly off-standard, with a short lateral concrete ramp, giving access to the main platform from one side. Parts of missiles – original – are being gathered in this area for display.

Monolith sites include two bunkers, which are the core of a strongly defended fenced area. In Javor 51, fences except the external one have been removed for the safety of visitors (rusty barbed wire can be very dangerous). These can still be found in other similar installations (see here). Similarly, the troops and technicians working on site lived in purpose-built housing, segregated from local communities. In Javor 51, this housing still exists, but cannot be visited.

Leaving the place, you can visit the nice visitor/gathering center, and even find some interesting souvenirs!

Getting there and visiting

All in all, the Atom Museum prepared at Javor 51 is a top destination for everybody interested in the history of the Cold War, nuclear warfare, Soviet history, military history, etc.

Credit goes to the owner of the place, Dr. Vaclav Vitovec, who is leading this remarkable preservation effort, and is a very knowledgeable and enthusiastic guide to the site for those visiting. Dr. Vitovec is also the owner of the border museum in Rozvadov, covered in this post.

The Javor 51 site is actually fairly well known at least to a dedicated public, having been visited by historians, scientists and notable figures – including Francis Gary Powers, Jr., who is very active in preserving the history of the Cold War.

The commitment of the museum’s managers is witnessed also by the nice website (also in English), where you can sign-up for a visit on pre-arranged days – as of 2022, all Saturdays in the warm season – or contact the staff for setting up a personalized visit. It is nice to see a good involvement by the local population (the great majority of visitors on regular visits are Czech), including many from younger generations. The exhibits tell much on the peaceful use of nuclear energy, and this is a major topic in the guided tour in Czech. Actually, the Czech Republic has a strong nuclear tradition, with many power plants in use, and a commitment for the development of nuclear energy in the future.

The location is around 25 miles southeast of Plzen, or 60 miles southwest of Prague. Easy to reach by car. The exact address is Míšov 51, 33563 Míšov, Czechia. Full info on their website. Visiting on a normal scheduled visit is on a partly-guided basis, meaning that you will get an intro (in Czech) of around 40 minutes, than you will be allowed to access the bunkers and visit on your own, for all the time you like. You might end up spending more than 2 hours checking out the site and everything is in it, if you have a special interest for the topic. Dr. Vitovec is fluent in English, and can provide much information upon request.

Javor 52 – Bělá pod Bezdězem

The Monolith-type site Javor 52 has been willingly demolished, likely by the Government of the Czech Republic, as it was the case for most other similar (or more in general, Soviet-related) sites in Poland and Germany.

However, it was hard to get completely rid of any trace of an installation so bulky and reinforced. Therefore, some remains can still be found and explored.

Some technical buildings still in use close to the bunkers may have been there from the days of operation.

Getting close to the bunker area, traces of the multiple fences originally around the site can be found, either in the trees or in the vicinity of unmaintained roads. Wooden or concrete posts with fragments of barbed wire are clearly visible. Also reinforced concrete shooting points can be spotted in the wild vegetation.

As typical, two bunkers were erected on site, and similarly to Javor 51 (see above), in Javor 52 they are aligned, with the entrances all along the same ideal orientation.

The bunkers in Javor 52 have been interred, so that they are now hardly noticeable from the outside, except to a careful eye. Looking inside the eastern one, it is possible to get a view of the open doors of the main airlock, providing a distant view of the inner main hall.

Descending through the lateral human-sized airlock is not possible except for a short length, from a concrete manhole on top of the bunker.

The western bunker is in a better general condition, and the main hall still retains a pretty unique writing in Russian. The ladder descending from the suspended platform has been substituted with a posthumous, regular ladder. Much metalwork has disappeared though, including the heat exchangers, the crane, and the tight doors.

Between the bunkers, a concrete pool can be found – still watertight! – with a function which is hard to guess. A pool for civil use was installed in Stolzenhain (and reportedly also in Javor 52, but I had not the time to watch out for it), but this was in the low-security of the site, far from the bunkers.

Getting there and moving around

Access to this place is possible without violating any property sign, but is clearly not encouraged. Going unnoticed is made tricky by the presence of a public facility nearby – a shelter for foreigners and some education activity. Parking out of sight is possible along the road 27235, north of the complex and to the west of the road – trailheads and corresponding parking areas can be found there. Check out some satellite map to find a way to the exact location of the bunkers – their respective entrances are approximately here (eastern bunker) and here (western bunker).

I visited the site in 2020, and the entrances appeared very dangerous and easy to seal in a permanent way. I do not have any further update, but would suggest to go prepared to find definitively interred and totally inaccessible bunkers.

Javor 50 – Bílina – Quick note

As of 2020, the site of Javor 50 is in a peculiar state of ‘conservation’. The place is closed to the public, but entering would be basically unimpeded, since the external fence to the former military base is mostly collapsed and interrupted. The Soviet quarters insider still have much to offer – including writing in Russian, a scheme of the base, and much more. Likely, the bunkers are also still in a relatively good shape.

Much surprisingly though, somebody is living there with watchdogs, in miserable conditions, keeping visitors out. It is likely that an official visit may be booked by getting in touch with the municipality, since it appears that the site is not used for anything. However I was not successful in connecting with anybody there, therefore I have no suggestion on this point. The of the main entrance is here.

Aircraft Carriers of the West Coast

Among the countless interesting places and sights the States of the West Coast have to offer, even aircraft carriers need to be mentioned. There are three ‘capital sites’ that will surely appeal to war veterans, pilots, seamen, historians, technicians, children and everybody with an interest for ‘CVs’ – an acronym for ‘carrier vessels’. Two are super-museums in California, where the USS Hornet and USS Midway are permanently preserved and open to the public, and a third is the Naval Shipyard in Bremerton, Washington, which is an active installation of the US Navy in the premises of the Naval Base Kitsap, where maintenance work is carried out on the current CV-fleet, and where part of the reserve fleet – including most notably some aircraft carriers – is moored.

Here you can find some photos of these sites from visits of mine in 2012 and 2014.

USS Hornet (CV-12) – Alameda, CA

This ship is an Essex-class carrier commissioned in late 1943. Since then, she saw extensive action throughout WWII in the Pacific theatre, being involved in frontline operations leading to the defeat of Japan. As a matter of fact, aircraft from this ship totalled a number of downed aircraft ranking second in the general list of aircraft carriers of the world, behind USS Essex – which enjoyed a full year of service more than Hornet during the war with Japan.

The original appearance of the ship was much different from today’s, first and foremost due to the straight-deck construction of the Essex-class – just like all other carriers until the Fifties. For Hornet the current shape of the deck is the result of SCB-125 modification in 1956, introducing an angled landing deck. This feature, which came along with other major changes to the overall structure also resulting in a significant weight increase, allowed independent take-off and landing operations. Differently from other ships of the class, Hornet wasn’t upgraded in the late-fifties with steam-powered catapults, retaining hydraulically powered ones instead, thus being incapable of launching heavier aircraft like the Phantom, Intruder, Vigilante, or even the Hawkeye. It was then assigned to a support role as an ASW carrier, equipped with Tracker aircraft and helicopters for anti-submarine missions.

In the late Sixties Hornet was involved in the race to the Moon, serving as a rescue platform for the first moonwalkers returning from the succesful Apollo 11 mission, and subsequently in the same role for the astronauts of Apollo 12.

Similarly to all other Essex-class vessels – with the exception of the venerable USS Lexington, operated as a training ship until late 1991! – it saw limited action in the Vietnam War, when much larger and more suited carriers had become available for war operations, and it was retired in the early Seventies.

During your visit you are basically free to move all around the many well-preserved areas under the flight deck.

There you can see the striking proportions of this relatively ‘small’ carrier. The mechanism of the central elevator can be seen to the bow of the ship. An impressive table with the number of targets hit recalls the primary role this ship had in WWII.

On the main aircraft storage level there are some preserved aircraft, not all from the history of this unit. Among the many interesting features in this area, a replica of the helicopter which took the astronauts of Apollo 11 on board. This very helicopter was used in Ron Howard’s movie ‘Apollo 13’ starring Tom Hanks. Also the mobile quarantine facility for the astronauts can be found here. Neil Armstrong’s very footsteps from the helicopter to the quarantine facility are marked with white paint.

Moving back to the stern of the ship it is possible to visit a very interesting technical area for aircraft maintenance and servicing, as well as for mission preparation. It reminds the primary role of aircraft carriers as a frontline-deployed, moving airbases, with everything that is necessary for operating the aircraft onboard on a regular basis for offensive missions. A hatch leading to the compartments on the lower levels has been left open, and this allows to appreciate the actual size of the ship, really huge, with multiple storage levels for aircraft spare parts and ordnance.

Also very interesting are the big fireproof sliding doors for cutting the aircraft storage deck into compartments in the event of fire – possibly due to some ordnance piercing the deck of the ship, as well as to accidental causes.

Further interesting sights in the self-guided part of the visit include the operational briefing room, some service rooms, dormitories and a large area for the anchor moving mechanisms.

A second part of the tour is guided. You move around is small groups and you access the flight deck and the ‘island’, the command and control center of all operations – deck management, flight mission control, and ship control & navigation. The guides are very knowledgeable and enthusiastic veterans, able to tell you detailed explanations of what you see as well as anecdotes from the history of the ship.

The Presidential Seal has been placed where president Nixon was standing to oversee the recovery of the moonwalkers from Apollo 11.

This part of the visit will be extremely interesting for more technically minded subjects – you will see original wind signals for landing aircraft, an original LORAN navigation device for sea navigation, the normal and emergency arresting systems, the Fresnel optical landing aid system, and tons of other extremely interesting items which were actually used in real operations.

From the stern of the ship and the flight deck it is possible to take fantastic pictures of downtown SFO.

Extra Feature – Treasure Island Pan Am Terminal

A little ‘extra’ you can find on your way if you are travelling from San Francisco via the SFO-Oakland Bay Bridge to the site fo the USS Hornet is Treasure Island. This artificial island was taken out of the water at the end of the Thirties for the Golden Gate International Exhibition in 1939. Coincidentally, Pan Am, which had recently inaugurated its trans-Pacific ‘Clipper’ air service with the huge Boeing 314 seaplane, built a facility on the island, with a passenger terminal and service hangars for maintenance. Operation of the Clipper were moved here for good, and the aircraft took off and alighted on water between Treasure Island and Yerba Buena Island, the smaller natural island to the south – the cove is today called Clipper Cove. Later on the service was relocated to Alameda as the island was taken over by the military.

Unlike most of the buildings dating from the exhibition, wiped out soon after it, the terminal survived and it is a proportionate, nice example of the airport building style of the late Thirties.

Also the foundations of some of the original passenger pier, as well as concrete slides for seaplane operations on the shore of Clipper Bay, can be seen still today. The Pan Am terminal building was used to simulate the terminal at Berlin Tempelhof in Steven Spielberg’s movie ‘Indiana Jones and the Last Crusade’.

Treasure Island is also a good place for taking pictures of downtown SFO, as well as the most famous items on the bay – Alcatraz and the Golden Gate Bridge.

Getting There

The ship is permanently anchored by one of the piers close to the former Alameda NAS, on the southern side of the island of Alameda. It can be reached very conveniently and quickly from downtown San Francisco via the Oakland bridge (I-80), and from Oakland, Berkeley, San Leandro and all districts on the eastern side of the bay. Full explanation and info on their website. Treasure Island is located roughly mid-way along the Oakland Bridge. Visiting the Pan Am terminal is a quick detour from the interstate. Large parking nearby both sites.

USS Midway (CV-41) – San Diego, CA

This is the first and the only remaining of the three Midway-class ‘super carriers’ – which included USS Franklin D. Roosevelt and USS Coral Sea. The origin of the class dates back to WWII, when it was decided that larger, armored, metal decks were to replace the vulnerable wooden decks of the Essex-class carriers. USS Midway was commissioned in September 1945, immediately after VJ-Day, with a straight deck, albeit steel-made. The steel construction was considered a relevant asset for jet aircraft operations, and all three carriers were kept in active service following the progressive transition to the new type of aircraft propulsion, with only minor modifications needed to the flight deck.

USS Midway was involved in the early stages of US missile experimentation, with the first tests of sea launched V-2 rocket clones, originating from the German design, and Regulus I air-breathing cruise missile.

The current shape of USS Midway is the result of subsequent major modifications. Program SCB-110 in the late Fifties added the angled deck to enhance simultaneous launch and recovery operations and flexible flight deck operations. Also the curved ‘hurricane-proof’ bow was added, together with steam-powered catapults.

In 1966 this ship was the only of the three of her class to receive the very expensive SCB-101.66 modification, resulting in a lengthening of the flight deck, the adoption of more powerful steam catapults and a new arrangement of the higher-load elevators. All three ships were on active duty in Vietnam, USS Midway apparently launching the first and last US air attacks of the war.

Even though USS Midway – the largest and best equipped of the three – could not operate the Tomcat, it could take four squadrons of Hornets, thus remaining effective in frontline service well into the Gulf War in the early Nineties, the last major operation in which she was involved before retirement and re-opening as a permanent exhibition – notably among the most popular in San Diego alongside the zoo.

Similarly to the USS Hornet described above, the tour of the Midway starts with a self-guided exploration of the aircraft storage deck and of the air deck. Among the tons of interesting sights here, to the bow you can find under the air deck the steam reservoir for the catapults and the system for moving the anchors.

Further back the main hangar for storing the aircraft is really huge. You can get an impression of the size of the ship by looking at the lower storage levels, where jet engines and air-launched ordnance are still visible.

With respect to the USS Hornet the exhibition is somewhat more ‘lively’, also with some reconstructed scenes, notice-boards, prepared dinner tables and so on. On the cons side, the place can get really crowded.

You can explore the crew areas, with dormitories, kitchens, canteens, medical services – including a fully equipped surgery compartment.