Trip-report Croatia 17-20 November 2023

Thank you very much for the trip. It was excellent, possibly my best bunker trip ever!” /TP

The group in front of the wreck of the C-47 close to Zeljava mountain hangar. Lars and Anders up in the plane. Photo: Branimir Belinić

Together with 10 participants I arrived to Zagreb airport in the afternoon of 17th November.
People from Sweden, Norway and U.K waited for the last two arriving around 3pm,
and we were off well before the 4pm deadline set up in the itinerary.

Branimir from Plitvice Outdoor Travel agency and colleague drove us towards our accommodation for two
nights in Grabovac. First off, we managed to look at the museum over the 1991-1994 war outside the town of Karlovac. This was found to be a nice museum with lots of artefacts from the war but the strongest memory from the visit was the local peoples candle ceremony along the main road, remembering the Vukovar massacre from 18th November 1991.

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Airport terminal in Zagreb.
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MiG-21 from Croatian airforce on display at museum in Karlovac.
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The museum had numerous different tanks, guns and howitzers used in different Yugoslavian conflicts.
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Example of a pill-box used in the 1990's war.

With some roadworks en-route to Plitvice Holiday resort it had gone dark when we arrived at our rooms. With tomorrow being a holiday to remember the lost and killed in the fight for sovereign we filled up snacks and drinks before heading to the local restaurant for dinner and planning for a full field day tomorrow.

Saturday 18th
started with a good breakfast and collection of lunch packages. At 09:00 three 4×4’s lined up to take us up in the mountains to the peak Gola Pljesevica. The road is possible to drive by yourself but in recent time and with refugees trying to enter the EU this way the Police are more and more active in the area,
and you are best to have an agreement with the local police to enter the border area.
The drive is only some 45 minutes up to the peak at around 1600 metres. The people in the first car was lucky enough to see a bear on the road for around 10 seconds before it disappeared into the forest.

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Early morning at the Plitvice Holiday resort.
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Early morning at the Plitvice Holiday resort.
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Early morning at the Plitvice Holiday resort.
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Early morning at the Plitvice Holiday resort.
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Early morning at the Plitvice Holiday resort.
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The road leading up to Gola Pljesevica.
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The Gola Pljesevica with the villa/barracks just at the highest peak and the modern radio/comms-station to the right.
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At the peak of Gola Pljesevica with morning mist still over Bihac town in Bosnia.
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At the peak of Gola Pljesevica with the huge cut-out marking the border between the two countries.
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At the peak of Gola Pljesevica looking down on the Zeljava air base.
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Branimir pointing at some interesting points at the peak of Gola Pljesevica.

The old army barrack and radar installation from the Cold war was later used by the UN for peace keeping and even later by NATO troops, so the peak has a long military history.
Views where wonderful, starting with clouds covering the Bihac valley and later clearing up. Most of the runways for the Bihac/Zeljeva air base could also be seen from up here – and the main purpose of the radar station was to feed information down to the air base.

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View from the top, a very famous rock to climb.
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The entrance down to the villa.
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Inside the villa.
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Part of the army and radar base.
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Inside on of the radar domes.
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Warning for mines on the way up along the road. Bosnian sign.
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Part of the army and radar base.
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Ventilations from below.
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Part of the army and radar base.
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The main barrack/villa for the base.
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Part of the army and radar base.
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Is it a space-ship ?
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Older airial, probably not in use anymore.

Our main goal was to explore the underground tunnels that mainly was transport tunnels to the vital radar installations but also served
as backup generator and dormitories. The main building is the huge villa on top of the peak, looking like something from the Alp region. While exploring the area and the tunnels you literally go between Croatia and Bosnia-Herzegovina all the time.

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Stairs leading down from inside the villa.
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A tunnel leading out on the Bosnian side.
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Tunnels and rooms.
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Tunnels and rooms.
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Tunnels and rooms.
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Tunnels and rooms.
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Tunnels and rooms.
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Tunnel leading down to the oil storage in a seperate part.
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Oil tanks in a seperate bunker, pipes feeding the generators below.
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Part of generator room.
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Tunnels and rooms.
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Rooms, either dormitories or command centre.
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Short emergency tunnel to the Croatian side.
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Tunnels and rooms.
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Some kind of ventilation close to one exit with a radar installation.
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Stairs leading up to the top radar installation.
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Radar installation with modern UN/NATO building inside the bunker.

After some tea, coffee, raki and lunch we headed back down the mountain after visiting the modern and active radio station, looking like the rocket used by Tin-Tin to go to the moon!

Photo: Branimir Belinić

Securely down on lower grounds we headed through some small villages and finally arrived at the small town of Zeljava and the start of the runways for the base.
A total of five runways with two larger and three more like emergency take-off are all in one way or another leading to the four entrances to the Zeljava mountain hangar.

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Entrance 1.
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Entrance 1.
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Entrance 2 in darkness. This was the main entrance for planes.
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Entrance 2 in darkness.
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Entrance 4.
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Outside entrance 4 looking towards the runways.
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Outside entrance 4, the border to Bosnia and non-EU.
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Runways and taxiways.
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Looking back towards entrance 2.
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Looking back towards entrance 2.
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From the main runway looking back to the Gola Pljesevica mountains.
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Runways.
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Runway 14L.
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Runway and mosque.
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Coffee break at the C-47.
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Coffee break at the C-47.
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Inside the C-47.
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Inside the C-47.

Object 505 or “Klek” merged from the Yugoslavian communist parties wishes to secure their
MiG fighters. They took and got help from us Swedes, developers were authorised to visit at least one of Sweden’s Cold War underground hangars and that visit led in some part to the development of the Zeljava mountain hangar – that probably is the biggest in Europe and one of the three known to exist within former Yugoslavia.

We started by entering entrance 1, the most northern of the four. Some started documenting right away and some walked the whole length of the system, ending at entrance 4 close to the Bosnian border. While outside talking Bosnian police patrolled the border 40 meters beyond our position but as we were white-skinned and had cameras they just waived and continued to search for immigrants trying to get into EU.

The tunnelsystem inside is to some part destroyed by the Yugoslavian army during the war with big detonations being set inside. Almost all equipment are also gone and most of the sewage and electrical systems and their channels are also taken away, probably by metal thieves during the over 20 years of neglect. Some rooms still have some maps and parts of furniture and the room for the surveillance squadron with photo developing stations are fairly intact.

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Just inside entrance 1, between the outer and inner blast doors.
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Looking into power plant close to entrance 1.
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Inside the regiment command centre there are plenty of maps still on the floor.
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Junction inside entrance 2 with maintenence straight ahead and the tunnel towards entrace 1 to the right. Note the balcony on the right.
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The observation balcony in another angle.
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Inner blast door at entrance 2.
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Maintenece area straigh ahead and tunnel 1 to the right.
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Inside missile test station.
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Inside missile test station.
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The shaft up to the operations centre.
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Tunnel leading into the shaft for operations centre.
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Inner blast door, entrance 3.
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Outer entrance 3 looking out into the dark Croatia night.
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One of many kerosene tanks close to entrance 3.
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Power plant inside tunnel 3.
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Power plant inside tunnel 3.
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Power plant inside tunnel 3.
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One of numerous ventilation tunnels.
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Tunnel 4 looking back towards junction with tunnel 3.
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Entrance 4.
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Entrance 4.
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The inner blast door in tunnel 4 has taken strong detonations in the attempts to destroy the base.
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Entrance 4.
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Inside the space for the sliding blast doors close to entrance 4.
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Details close to entrance 4.
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Remains of inner blast door, entrance 4.
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Part of operations centre.
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Part of equipment warehouse.
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Part of operations centre.
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Part of communications centre with tons of old film for surveillence photos.
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Part of surveillence area with film development.
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Kitchen.
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The centre of the operations chambers with compressor chamber.
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Looking into the equipment warehouse.
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We had a special object to look for, the alleged elevator going up to the command bunker some 50-60 metres up the mountain. Some of us found remains of what could have been an installation in a wider shaft and in the area that some maps said that the command centre should be. Time flew and the last car left the hangar well after dark for the 30 min drive back to the resort and the much-welcomed dinner.

Sunday 19th
Sunday was a bit warmer and more clouds in the sky. We headed back to Zeljava once more for visit to the old barracks and to the main runway that is furthest away from the mountain.

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Branimir and Jan discussing outside an abandoned army barack.
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Note the holders for flags a bit up the lamppost.
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Inside baracks.
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Boilers for heat water, that was distributed in an underground system of pipes.
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Laundry facillity.
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A cinema and/or thatre.
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Inside baracks.
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The road had very straight and dense trees that looked planeted to hide the road from airial observations.
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Tool shop and repair facillity for heavier vehicles.
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A underground stable.
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Inside baracks.
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Inside baracks, probably kitchen and dining room.
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One barack was full of paintings.
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One barack was full of paintings.
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One of many baracks.

Me and at least 1-2 more needed more time in the tunnels. We had also persuaded Branimir to hike up the mountain side to check for the command centre, that we knew was somewhere between entrance two and three. We
said we should meet up in an hour again. I went back to the alleged elevator shaft to take some vertical photos of the shaft when I all of a sudden heard voices and when looking up a torch! I’d made contact with Branimir some 50 meters up!
We rendezvoused outside and at bit over half the group headed up the very steep slope towards the command centre. All over this slope there were small white flags from the de-mining companies that had cleared the area. After a tough climb we were finally inside the burned-out command centre/control tower and could both look down the shaft and out the observation windows towards the system of runways below.

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The climb up towards the post.
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The post coming up through the bushes.
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The look-out part of the command post.
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The main room in the command post.
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The look-out in the post.
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Looking back in the post, the end of the elevator to the left.
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The entrance part.
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Entering the post.
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The top of the elevator ending in the main room of the post.
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Branimir and Tony on the way down.

Very satisfied with the visit we now headed back towards Zagreb with one more major stop on the way. One of Tito’s some 20-30 villas are abandoned in the hills of the national park. To our surprise there was also some underground tunnels that was used for escape from the villa, ending some 300 meters away in the dense woods.

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The front with the main entrance.
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The main staircase from the entrance.
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In the center garden area.
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The outer wall.
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What is supposted to be a bowling arena.
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More stairs in the main hall.
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The main hall.
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A cinema.
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Tito had his own elevator up to his private suit.
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The other appartments were divided on the upper floor, each having their own entrance from the lower floor.
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Stairs leading up to an appartment.
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The road up to some houses and the exit of the tunnel system.
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Combined areas for recration/dining.
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A small oil storage in an underground space.
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The exit from the tunnel system from the villa. We used it as entrance.
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The exit seen from inside.
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The tunnelsystem.
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The tunnelsystem.

We could explore the once very fancy villa, now derelict. After another nice visit we had a last 2h drive back to our hotel in Zagreb where our guides left us and could head back to their families. We explored
Zagreb by night with a restaurant visit and some of us check out the old shelter tunnels.

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Zagreb main square by night.
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Zagreb main square by night.
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One of many entrances to the tunnel system from the 2WW.
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One of many entrances to the tunnel system from the 2WW.
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One of many entrances to the tunnel system from the 2WW.
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Map over the system with the main shelter in the middle.
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One of the tunnels.
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One of the tunnels.
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Details.
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Coming into the shelter.
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The shelter was probably in two stories from the beginning with the holes half way up being the beams for the upper floor.
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A short fernicular in night time...
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...and daytime.
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At central railway station.
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At central railway station.
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At central railway station. Holocaust memorial of trains departing from this station to Auswitch.

Last day had us on different departures from Zagreb. Most of us had a walk in downtown before heading out to the airport.