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Concrete
military bunkers A bunker is a defensive military fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. T ...
are a ubiquitous sight in
Albania Albania ( ; sq, Shqipëri or ), or , also or . officially the Republic of Albania ( sq, Republika e Shqipërisë), is a country in Southeastern Europe. It is located on the Adriatic and Ionian Seas within the Mediterranean Sea and shares ...
, with an average of 5.7 bunkers for every square kilometre (14.7 per square mile). The bunkers ( sq, bunkerët) were built during the Stalinist and anti-revisionist government of Enver Hoxha from the 1960s to the 1980s, as the regime fortified Albania by building more than 750,000 bunkers Hoxha's program of "bunkerization" (''bunkerizimi'') resulted in the construction of bunkers in every corner of the then
People's Socialist Republic of Albania The People's Socialist Republic of Albania ( sq, Republika Popullore Socialiste e Shqipërisë, links=no) was the Marxist–Leninist one party state that existed in Albania from 1946 to 1992 (the official name of the country was the People's R ...
, ranging from mountain passes to city streets. They were never used for their intended purpose during the years that Hoxha governed. The cost of constructing them was a drain on Albania's resources, diverting them away from more pressing needs, such as dealing with the country's housing shortage and poor roads. The bunkers were abandoned following the dissolution of the communist government in 1992. A few were used in the Albanian insurrection of 1997 and the
Kosovo War The Kosovo War was an armed conflict in Kosovo that started 28 February 1998 and lasted until 11 June 1999. It was fought by the forces of the Federal Republic of Yugoslavia (i.e. Serbia and Montenegro), which controlled Kosovo before the wa ...
of 1999. Most are now derelict, though some have been reused for a variety of purposes, including residential accommodation, cafés, storehouses, and shelters for animals or the homeless.


Background

From the
end End, END, Ending, or variation, may refer to: End *In mathematics: ** End (category theory) ** End (topology) **End (graph theory) ** End (group theory) (a subcase of the previous) **End (endomorphism) *In sports and games **End (gridiron footbal ...
of
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...
to his death in April 1985, Enver Hoxha pursued a style of politics informed by hardline Stalinism as well as elements of
Maoism Maoism, officially called Mao Zedong Thought by the Chinese Communist Party, is a variety of Marxism–Leninism that Mao Zedong developed to realise a socialist revolution in the agricultural, pre-industrial society of the Republic of Ch ...
. He broke with the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, ...
after
Nikita Khrushchev Nikita Sergeyevich Khrushchev (– 11 September 1971) was the First Secretary of the Communist Party of the Soviet Union from 1953 to 1964 and chairman of the country's Council of Ministers from 1958 to 1964. During his rule, Khrushchev s ...
embarked on his reformist Khrushchev Thaw, withdrew Albania from the
Warsaw Pact The Warsaw Pact (WP) or Treaty of Warsaw, formally the Treaty of Friendship, Cooperation and Mutual Assistance, was a collective defense treaty signed in Warsaw, Poland, between the Soviet Union and seven other Eastern Bloc socialist repub ...
in 1968 in protest of the
Warsaw Pact invasion of Czechoslovakia The Warsaw Pact invasion of Czechoslovakia refers to the events of 20–21 August 1968, when the Czechoslovak Socialist Republic was jointly invaded by four Warsaw Pact countries: the Soviet Union, the Polish People's Republic, the People's Rep ...
, and broke with China after U.S. President
Richard Nixon's 1972 visit to China The 1972 visit by United States President Richard Nixon to the People's Republic of China (PRC) was an important strategic and diplomatic overture that marked the culmination of the Nixon administration's resumption of harmonious relations betwe ...
. His government was also hostile towards the country's immediate neighbours. Albania did not end its state of war with
Greece Greece,, or , romanized: ', officially the Hellenic Republic, is a country in Southeast Europe. It is situated on the southern tip of the Balkans, and is located at the crossroads of Europe, Asia, and Africa. Greece shares land borders ...
, left over from the Second World War, until as late as 1987 – two years after Hoxha's death – due to Greek territorial ambitions in southern Albania as well as Greece's status as a
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...
member state. Hoxha was virulently hostile towards the government of Josip Broz Tito in
Yugoslavia Yugoslavia (; sh-Latn-Cyrl, separator=" / ", Jugoslavija, Југославија ; sl, Jugoslavija ; mk, Југославија ;; rup, Iugoslavia; hu, Jugoszlávia; rue, label=Pannonian Rusyn, Югославия, translit=Juhoslavija ...
, accusing Tito's government of maintaining "an anti-Marxist and chauvinistic attitude towards our Party, our State, and our people". He asserted that Tito intended to take over Albania and make it into the seventh republic of Yugoslavia, and castigated the Yugoslav government's treatment of ethnic
Albanians in Kosovo The Albanians of Kosovo ( sq, Shqiptarët e Kosovës, ), also commonly called Kosovo Albanians, Kosovar/Kosovan Albanians or Kosovars/Kosovans, constitute the largest ethnic group in Kosovo. Kosovo Albanians belong to the ethnic Albanian sub-gr ...
, claiming that "Yugoslav leaders are pursuing a policy of extermination there." Albania still maintained some links with the outside world at this time, trading with neutral countries such as
Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...
and Sweden, and establishing links across the
Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Sea) to t ...
with its former invader
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...
. However, a modest relaxation of domestic controls was curtailed by Hoxha in 1973 with a renewed wave of repression and purges directed against individuals, the young and the
military A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typically authorized and maintained by a sovereign state, with its members identifiable by their distinct ...
, whom he feared might threaten his hold on the country. A new constitution was introduced in 1976 that increased the Labor Party's control of the country, limited private property, and forbade foreign loans. The country sank into a decade of isolation and economic stagnation, virtually cut off from the outside world.


Military doctrine

Starting in 1967 and continuing until 1986, the Albanian government carried out a policy of "bunkerisation" that saw the construction of hundreds of thousands of bunkers across the country. They were built in every possible location, ranging from "beaches and mountains, in vineyards and pastures, in villages and towns, even on the manicured lawns of Albania's best hotel". Hoxha envisaged Albania fighting a two-front war against an attack mounted by Yugoslavia, NATO or the Warsaw Pact, involving a simultaneous incursion by up to eleven enemy airborne divisions. As he put it, "If we slackened our vigilance even for a moment or toned down our struggle against our enemies in the least, they would strike immediately like the snake that bites you and injects its poison before you are aware of it."''The Trauma Controversy'', p. 177 Albania's military doctrine was based on a concept of "
people's war People's war ( Chinese: 人民战争), also called protracted people's war, is a Maoist military strategy. First developed by the Chinese communist revolutionary leader Mao Zedong (1893–1976), the basic concept behind people's war is to main ...
,” drawing on the experience of the
Albanian resistance during World War II Albanian may refer to: *Pertaining to Albania in Southeast Europe; in particular: **Albanians, an ethnic group native to the Balkans **Albanian language **Albanian culture **Demographics of Albania, includes other ethnic groups within the country ...
, which Hoxha had led. The Partisans' victory was mythologized on a massive scale by the Hoxha regime, which used its wartime successes to legitimise its rule. The Albanian People's Army was based on the Partisan model and built around infantry units; 75 percent of the regular forces and 97 percent of reservists were employed in infantry roles. Partisan strategy was mountain-based guerrilla warfare, in which they took refuge in the mountains and launched raids into the less defensible lowlands. By contrast, Hoxha aimed to defend Albania's national integrity and sovereignty "at all costs", which necessitated defending the lowlands as well. The bunkers were therefore intended to establish defensive positions across the entirety of the country. Smaller ones were laid out in lines radiating out within sight of a large command bunker, which was permanently manned. The commanders of the large bunkers would communicate with their superiors by radio and with the occupants of the smaller bunkers by making visual signals that could be seen through slits. The regime also sought intensively to militarise civilians. 800,000 people out of a population of about three million served in defence in some way, ranging from the regular armed forces and reserves to civil defence and student armed youth units. Many sectors of the government, state-owned businesses and the public service were also given roles in defence, meaning that almost the entire population was brought in one way or another into the scope of state defence planning. From the age of three, Albanians were taught that they had to be "vigilant for the enemy within and without," and propaganda slogans constantly emphasised the need for watchfulness. Citizens were trained from the age of 12 to station themselves in the nearest bunker to repel invaders. Local Party cells organised families to clean and maintain their local bunkers, and civil defence drills were held at least twice a month, lasting for up to three days, in which civilians of military age of both sexes were issued with rifles (but no ammunition). Members of the Young Pioneers, the Hoxhaist youth movement, were trained to defend against airborne invasion by fixing pointed spikes to treetops to impale descending foreign parachutists. Despite the militarisation of the population, the Albanian defence system was massively inefficient and took little account of the country's real defence needs; training was minimal, fuel and ammunition were scarce, uniforms and equipment were of poor quality, weapons were antiquated and the military lacked a proper command and control system.


Construction

The bunkers were constructed of concrete, steel and iron and ranged in size from one- or two-person pillboxes with gun slits to large underground nuclear bomb shelters intended for use by the Party leadership and bureaucrats. The most common type of bunker is a small concrete dome set into the ground with a circular bottom extending downwards, just large enough for one or two people to stand inside. Known as ''Qender Zjarri'' ("firing position") or QZ bunkers, they were prefabricated and transported to their final positions, where they were assembled. They consist of three main elements: a diameter hemispherical concrete dome with a firing slit, a hollow cylinder to support the dome and an outer wall with a radius larger than the cylinder. The gap between the cylinder and outer wall is filled with earth. At various places along the coast, large numbers of QZ bunkers were built in groups of three, linked to each other by a prefabricated concrete tunnel. Elsewhere bunkers were constructed in groupings around strategic points across the country, or in lines across swathes of territory. Tirana was particularly heavily defended, with thousands of bunkers radiating out in fifty concentric circles around the city. The QZ bunker was designed by
military engineer Military engineering is loosely defined as the art, science, and practice of designing and building military works and maintaining lines of military transport and military communications. Military engineers are also responsible for logistics ...
Josif Zagali, who served with the Partisans during World War II and trained in the Soviet Union after the war. He observed how dome-shaped fortifications were virtually impervious to artillery fire and bombs, which simply ricocheted off the dome. He used his knowledge to design the subsequently ubiquitous dome-shaped bunkers. Hoxha was initially delighted with the design and had many thousands of Zagali's bunkers constructed. Zagali himself was promoted to the rank of colonel and became chief engineer of the Albanian Ministry of Defence. However, Hoxha's paranoia led to Zagali being purged in 1974 and imprisoned for eight years on false charges of "sabotage" as a "foreign agent". His wife went insane, his family was shunned by friends and acquaintances, and his daughter died of breast cancer. Zagali later said that it was "a painful and tragic fate not only for me and my family but for thousands and thousands of such families in Albania who have experienced the dictatorship of Enver Hoxha". His experiences were later used as the basis of ''
Kolonel Bunker ''Kolonel Bunker'' is an Albanian, French and Polish historical film released in 1996. It was selected as the Albanian entry for the Best Foreign Language Film at the 69th Academy Awards, but was not accepted as a nominee.Margaret Herrick Library, ...
'', a film by Albanian director Kujtim Çashku.


Command and control bunkers

The command-and-control bunkers, known as ''Pike Zjarri'' ("firing point") or PZ bunkers, were also prefabricated and assembled on site. They are far larger and heavier than the QZ bunkers, with a diameter of . They are made from a series of concrete slices, each weighing eight or nine tons, which were concreted together on site to form an interlocking dome. Fully assembled, they weigh between 350–400 tons.


Large bunkers and tunnels

There was also a third category of larger "special structures" for strategic purposes. The largest were bunker complexes tunnelled into mountains. At Linza near the capital,
Tirana Tirana ( , ; aln, Tirona) is the capital and largest city of Albania. It is located in the centre of the country, enclosed by mountains and hills with Dajti rising to the east and a slight valley to the northwest overlooking the Adriatic Sea ...
, a network of tunnels some long was built to protect members of the Interior Ministry and the
Sigurimi The Directorate of State Security (), commonly called the ''Sigurimi'', was the state security, intelligence and secret police service of the People's Socialist Republic of Albania. Its proclaimed goal was maintaining state security of Albania, ...
(the secret police) from nuclear attack. Elsewhere, thousands of kilometres of tunnels were built to house political, military and industrial assets. Albania is said to have become the most tunnelled country in the world after
North Korea North Korea, officially the Democratic People's Republic of Korea (DPRK), is a country in East Asia. It constitutes the northern half of the Korean Peninsula and shares borders with China and Russia to the north, at the Yalu (Amnok) and T ...
. The tunnels were built in conditions of great secrecy. Engineering teams were not allowed to see construction through to completion but were rotated from site to site on a monthly basis.


Impact

The bunkerisation programme was a massive drain on Albania's weak
economy An economy is an area of the production, distribution and trade, as well as consumption of goods and services. In general, it is defined as a social domain that emphasize the practices, discourses, and material expressions associated with the ...
. The construction of prefabricated bunkers alone cost an estimated two percent of net material product, and in total the bunkers cost more than twice as much as the Maginot Line in
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of overseas regions and territories in the Americas and the Atlantic, Pacific and Indian Oceans. Its metropolitan area ...
, consuming three times as much concrete. The programme diverted resources away from other forms of development, such as roads and residential buildings. On average, they are said to have each cost the equivalent of a two-room apartment and the resources used to build them could easily have resolved Albania's chronic shortage of housing. According to Josif Zagali, building twenty smaller bunkers cost as much as constructing a kilometre of road. It also had a human cost; 70–100 people a year died constructing the bunkers. In addition, the bunkers occupied and obstructed a significant area of arable land. The bunkerisation of the country had effects that went beyond their ubiquitous physical impact on the landscape. The bunkers were presented by the Party as both a symbol and a practical means of preventing Albania's subjugation by foreign powers, but some viewed them as a concrete expression of Hoxha's policy of isolationism – keeping the outside world at bay. Some Albanians saw them as an oppressive symbol of intimidation and control. Albanian author
Ismail Kadare Ismail Kadare (; spelled Ismaïl Kadaré in French; born on 28 January 1936) is an Albanian novelist, poet, essayist, screenwriter, and playwright. He is a leading international literary figure and intellectual. He focused on poetry until the pu ...
used the bunkers in his 1996 novel ''
The Pyramid A pyramid is a structure with triangular lateral surfaces converging to an apex. Pyramid may also refer to: Anatomy and medicine * Petrous part of the temporal bone, the pyramid * Pyramid (brainstem), the anterior part of medulla oblongata Ga ...
'' to symbolise the Hoxha regime's brutality and control, while Çashku has characterised the bunkers as "a symbol of
totalitarianism Totalitarianism is a form of government and a political system that prohibits all opposition parties, outlaws individual and group opposition to the state and its claims, and exercises an extremely high if not complete degree of control and regu ...
" because of the "isolation psychology" that they represented. It has been argued that the bunkerisation programme was a form of "patterned large-scale construction" that "has a disciplinary potential as a means of familiarising a population with a given order of rule". Hoxha's strategy of "
people's war People's war ( Chinese: 人民战争), also called protracted people's war, is a Maoist military strategy. First developed by the Chinese communist revolutionary leader Mao Zedong (1893–1976), the basic concept behind people's war is to main ...
" also caused friction with the Albanian Army. The bunkers had little military value compared with a conventionally equipped and organised professional army. As one commentator has put it, "How long could one man in each bunker hold out? How would you resupply each individual bunker? How would they communicate with each other?" General Beqir Balluku, the
Defense Minister A defence minister or minister of defence is a cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from country to country; in s ...
and a member of the Politburo, publicly criticised the bunker system in a 1974 speech and disputed Hoxha's line that Albania was under equal threat from the United States and the Soviet Union.''Albania as Dictatorship and Democracy'', p. 632 He argued that Albania needed a modern, well-equipped professional army rather than a poorly trained and equipped civilian militia. Hoxha responded by having Ballaku arrested, accusing him of being an agent of the Chinese and of working to bring about a
military coup A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typically authorized and maintained by a sovereign state, with its members identifiable by their distinct ...
. Dubbed "the arch-traitor Ballaku", the general and his associates were convicted and punished according to "the laws of the
dictatorship of the proletariat In Marxist philosophy, the dictatorship of the proletariat is a condition in which the proletariat holds state power. The dictatorship of the proletariat is the intermediate stage between a capitalist economy and a communist economy, whereby the ...
" – meaning that they were
executed Capital punishment, also known as the death penalty, is the state-sanctioned practice of deliberately killing a person as a punishment for an actual or supposed crime, usually following an authorized, rule-governed process to conclude that t ...
. Many other military figures, such as bunker designer Josif Zagali, were also caught up in the 1974 purges. The introduction of a new
constitution A constitution is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity and commonly determine how that entity is to be governed. When these princ ...
two years later sealed Hoxha's absolute control of the military by appointing him as Commander-in-Chief of the Albanian People's Army and Chairman of the Defence Council.


Post-Hoxha

The bunkerization programme was stopped soon after Hoxha's death in 1985, leaving Albania's towns and countryside dotted with vast numbers of defensive bunkers. The bunkers still feature prominently in the Albanian landscape. A
BBC #REDIRECT BBC #REDIRECT BBC Here i going to introduce about the best teacher of my life b BALAJI sir. He is the precious gift that I got befor 2yrs . How has helped and thought all the concept and made my success in the 10th board exam. ...
...
reporter described in 1998 how they were ubiquitous on the road between Tirana and the city's airport, "looking down from every hillside, sprouting out of every bank". The solidity of the bunkers has made removal difficult. Some have been removed, particularly in cities, but in the countryside most bunkers have simply been abandoned. Some have been reused as housing for animals or as storehouses; others have been abandoned to lie derelict due to the cost of removing them. The extreme secrecy of Hoxha's regime meant that Albania's subsequent governments lacked information on how the bunkers had been used, or even how many had been built. In 2004 Albanian officials discovered a forgotten stockpile of 16 tons of mustard gas and other chemical weapons in an unguarded bunker only from Tirana. The
United States government The federal government of the United States (U.S. federal government or U.S. government) is the national government of the United States, a federal republic located primarily in North America, composed of 50 states, a city within a feder ...
gave Albania $20 million to destroy the weapons. In other places, abandoned bunkers have become a lethal danger. In 2008 alone, at least five holiday-makers drowned when they were caught in whirlpools created by water currents around bunkers that had subsided into the sea. The Albanian army has carried out bunker removal programmes along the coastline, dragging them out of the ground with modified Type 59 tanks. Although the bunkers were never used in a real conflict during Hoxha's rule, some found use in conflicts that broke out in the 1990s. During the Albanian insurrection of 1997, the townspeople of
Sarandë Sarandë (; sq-definite, Saranda; el, Άγιοι Σαράντα, Ágioi Saránta) is a city in the Republic of Albania and seat of Sarandë Municipality. Geographically, the city is located on an open sea gulf of the Ionian Sea within the Medi ...
in southern Albania were reported to have taken up positions in bunkers around the town in the face of fighting between government troops and rebels. After the outbreak of the
Kosovo War The Kosovo War was an armed conflict in Kosovo that started 28 February 1998 and lasted until 11 June 1999. It was fought by the forces of the Federal Republic of Yugoslavia (i.e. Serbia and Montenegro), which controlled Kosovo before the wa ...
of 1999, border villages in Albania were repeatedly shelled by Serbian artillery batteries located in nearby Kosovo and local people used the bunkers to shelter from the shelling. Kosovo Albanian refugees took to using bunkers as temporary shelters until aid agencies could move them into tent camps, while
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...
troops stationed in Albania relocated dozens of bunkers to fortify their base at
Kukës Kukës ( sq-definite, Kukësi) is a city in the Republic of Albania. The city is the capital of the surrounding municipality of Kukës and county of Kukës, one of 12 constituent counties of the republic. It spans and had a total population of 1 ...
. The Kosovo Liberation Army also used them as defensive positions during the Kosovo War, though this was not without its risks; on at least one occasion bunkers along Albania's border with Kosovo were mistakenly bombed by NATO aircraft. An acute shortage of housing after the fall of the Hoxha dictatorship in 1992 led some Albanians to set up homes in abandoned bunkers, though the lack of running water and sanitation meant that the area around inhabited bunkers soon became contaminated and unhealthy. A few bunkers have found more creative uses. In the coastal city of
Durrës Durrës ( , ; sq-definite, Durrësi) is the second most populous city of the Republic of Albania and seat of Durrës County and Durrës Municipality. It is located on a flat plain along the Albanian Adriatic Sea Coast between the mouths of ...
one beachside bunker has been turned into the ''Restaurant Bunkeri'',''The Trauma Controversy'', p. 179 and another bunker in
Gjirokastër Gjirokastër (, sq-definite, Gjirokastra) is a List of cities and towns in Albania, city in the Republic of Albania and the seat of Gjirokastër County and Gjirokastër Municipality. It is located in a valley between the Gjerë mountains and th ...
was turned into a café. There have been various suggestions for what to do with them: ideas have included
pizza oven Pizza (, ) is a dish of Italian origin consisting of a usually round, flat base of leavened wheat-based dough topped with tomatoes, cheese, and often various other ingredients (such as various types of sausage, anchovies, mushrooms, oni ...
s, solar heaters,
beehive A beehive is an enclosed structure in which some honey bee species of the subgenus '' Apis'' live and raise their young. Though the word ''beehive'' is commonly used to describe the nest of any bee colony, scientific and professional literature ...
s, mushroom farms, projection rooms for drive-in cinemas,
beach hut A beach hut (also known as a beach cabin, beach box or bathing box) is a small, usually wooden and often brightly coloured, box above the high tide mark on popular bathing beaches. They are generally used as a shelter from the sun or wind, chan ...
s, flower planters,
youth hostel A hostel is a form of low-cost, short-term shared sociable lodging where guests can rent a bed, usually a bunk bed in a dormitory, with shared use of a lounge and sometimes a kitchen. Rooms can be mixed or single-sex and have private or shared ...
s, and kiosks. In November 2014, a "five star" nuclear shelter built near Tirana for Hoxha was opened as a tourist attraction and art exhibition. The large bunker contains a museum with exhibits from World War II and the Hoxhaist period. Albania's bunkers have become a national symbol. Pencil holders and ashtrays in the shape of bunkers have become one of the country's most popular tourist souvenirs. One such line of bunker souvenirs was promoted with a message to buyers: "Greetings to the land of the bunkers. We assumed that you could not afford to buy a big one."


See also

* Architecture of Albania


References


External links


Mushrooms of Concrete
from International Documentary Film Festival Amsterdam
Paranoid Dictator’s Communist-Era Bunkers Now a National Nuisance
from Wired Magazine
Awaiting the Enemy that Never Came: The Bunkers of Albania
from Atlas Obscura
Underground Bunker of Enver Hoxha Official Website

Albania Has a Bunker Problem
from War is Boring {{Cold War People's Socialist Republic of Albania Fortifications in Albania Bunkers in Europe Concrete shell structures