Subterranea Subterranea Air raid shelters are structures for the protection of the civil population as well as military personnel against enemy attacks from the air. ...more on Wikipedia about "Air-raid shelter"
A basement is a story or several stories of a building that are either completely or partially below the ground floor. Not all buildings have basements. ...more on Wikipedia about "Basement"
A blast shelter is a place where people can go to protect themselves from bomb blasts. It differs from a fallout shelter, in that its main purpose is to protect from shock waves and overpressure, instead of from radiation - laden precipitation, as a fallout shelter does. It is also possible for a shelter to protect from both blast and fallout. ...more on Wikipedia about "Blast shelter"
Libels on Brighton ...more on Wikipedia about "Brighton sewers"
A bunker is a defensive warfare fortification to protect personnel or equipment. ...more on Wikipedia about "Bunker"
COBR (for Cabinet Office Briefing Rooms) is a UK government coordination facility which is activated in cases of national or regional emergency or crisis, or during events abroad with major implications for the UK. It is often referred to as COBRA (or Cobra; see initialism), in apparent confusion with the relatively benign conference room A of the Cabinet Office, but this usage is established even within the government. The term COBR is used both for the actual facility, and for the committees which meet there. ...more on Wikipedia about "Cabinet Office Briefing Rooms"
The Capuchin catacombs of Palermo are burial catacombs in Palermo, Sicily. ...more on Wikipedia about "Capuchin catacombs of Palermo"
In Ukraine and Russia, catacomb (used in the local languages' plural katakomby) also refers to the network of abandoned caves and tunnels earlier used to mine stone, especially limestone. Such catacombs are situated in Crimea and the Black Sea coast of these two countries. The most famous are catacombs beneath Odessa and Ajimushkay, Crimea, Ukraine. They served as bases for Soviet World War II guerrillas (see also Great Patriotic War). Ajimushkay catacombs hosted about 10.000 fighters and refugees. Many of them died and were buried there, and memorials and museums were later established (it is now a territory of Kerch city). ...more on Wikipedia about "Catacombs"
The Catacombs of Paris is a famous burial place in Paris, France. It is a network of subterranean chambers and galleries that is located in what were Roman-era limestone quarries. They were converted into a mass tomb near the end of the 18th century. ...more on Wikipedia about "Catacombs of Paris"
The Catacombs of Rome are ancient Jewish and Christian underground burial places near Rome, Italy. ...more on Wikipedia about "Catacombs of Rome"
A cave is a natural underground void large enough for an adult human to enter. Some scientists stipulate that it must be large enough that some portion of it will not receive daylight; however, in popular usage, the term includes smaller spaces like cliff cavities, rock shelters and sea caves. Speleology is the scientific exploration and study of all aspects of caves. The act of exploring a cave for recreation is called ' caving', 'potholing', or occasionally (only in the USA) ' spelunking'. ...more on Wikipedia about "Cave"
Cave Clan is a primarily Australian group dedicated to urban exploration. The organisation has branches in all capital cities of Australia and associates in other countries. Unlike traditional caving groups they do not limit their activities to natural cavities. They are generally regarded as the first organised urban exploration group in Australia, and are certainly the most long-lived. ...more on Wikipedia about "Cave Clan"
Cave rescue is a highly specialized field of rescue in which injured or trapped people are removed from or treated in caves and other underground space. Cave rescue borrows from firefighting, confined space rescue, and rope rescue, but also has developed its own special techniques and skills for performing work in conditions that are almost always difficult and demanding. ...more on Wikipedia about "Cave rescue"
Corsham Computer Centre (CCC) is an underground British government installation near RAF Corsham and RAF Rudloe Manor in the heavily-tunneled Corsham area of Wiltshire. The exact details of the operations at the CCC are not publicly known, although there is much speculation about their nature. ...more on Wikipedia about "Corsham Computer Centre"
A fallout shelter is a civil defense measure intended to reduce casualties in a nuclear war. Nuclear fallout is radioactive dust created when a nuclear weapon explodes. The explosion vaporizes any material within the fireball, including the ground if it is nearby. Much of this material is exposed to neutrons from the explosion, absorbs them, and becomes radioactive. When this material condenses in the cloud, it forms dust and light sandy material that resembles ground pumice. The fallout emits gamma rays. Much of this highly radioactive material then falls to earth, subjecting anything within the line of sight to gamma radiation, a significant hazard. A fallout shelter is designed to allow its occupants to avoid exposure to harmful fallout until radioactivity has lowered to a safer level. ...more on Wikipedia about "Fallout shelter"
Forestiere Underground Gardens located at 5021 W. Shaw Avenue in Fresno, California are an unusual manmade creation built by Baldasare Forestiere, an immigrant from Sicily over a period of 40 years from 1906 to until his death in 1946. The gardens, while subterranean, do have many skylights and catchbasins for water. There are a wide variety of hybrids and grafted trees, and the underground temperature helps prevent against frost. It is still operated by members of the Forestiere family. ...more on Wikipedia about "Forestiere Underground Gardens"
Hawthorn, Wiltshire, better known as Corsham, British nuclear bunker built 120ft below RAF Rudloe Manor, Corsham, Wiltshire, this was, and remains, an important complex of subterranean facilities constructed from the 1940s onwards probably to the 1960s. Until at least the early 1990s it contained the emergency government command centre ( Central Government War Headquarters) in the event of war. It is now largely abandonded, and may never have been fully operational due to cost and inconvenience. ...more on Wikipedia about "Hawthorn, Wiltshire"
The phrase hollow earth refers to the esoteric idea that the planet Earth has a hollow interior, almost always associated with the idea that it has a habitable inner surface. Although at one time adventure literature made this idea popular and even commonplace, the notion now receives little support; substantial geodetic evidence has long controverted it and the scientific community dismisses it as pseudoscience. ...more on Wikipedia about "Hollow Earth"
The Post Office Railway, also known as Mail Rail, is a narrow gauge driverless private underground railway in London built by the Post Office to move mail between sorting offices. Inspired by the Chicago Tunnel Company, it was in operation from 1927 until 2003. ...more on Wikipedia about "London Post Office Railway"
A manhole or maintenance hole is the top opening to an underground vault used to house an access point for making connections or performing maintenance on underground and buried public utility and other services including sewers, telephone, electricity, storm drains and gas. It is protected by a manhole cover, a (usually metal) plug designed to prevent accidental or unauthorised access to the manhole. ...more on Wikipedia about "Manhole"
A manhole cover is a removable plate forming the lid over the opening of a manhole, to prevent someone from falling in and to keep unauthorized persons out. ...more on Wikipedia about "Manhole cover"
Manhole cover theft is the phenomenon of manhole covers being stolen, usually for resale as scrap. Long considered to be a childish prank in the United States, this type of theft is often expensive to municipalities, and dangerous to their residents. ...more on Wikipedia about "Manhole cover theft"
The Mexican Perforation is a French artistic movement that seeks to express their ideas in underground places. ...more on Wikipedia about "Mexican Perforation"
A number of military citadels exist under central London, dating mostly from the Second World War and the Cold War. It is already well known that a large network of tunnels exists below London for a variety of communications, civil defence and military purposes (see, for instance, War Plan UK by Duncan Campbell or Beneath the City Streets by Peter Laurie). It is very much less clear how these tunnels, and the various facilities linked to them, fit together. Even the number and nature of these facilities is unclear; only a few have been officially admitted to. ...more on Wikipedia about "Military citadels under London"
Mole People is a term used to refer to the indefinite number of homeless people who live under New York City in abandoned subway tunnels. Estimates of the number of individuals living in this way are hard to obtain, but a 1989 survey suggested they numbered around 5,000. While it is generally accepted that some homeless people in large cities do indeed make use of accessible, abandoned underground structures for shelter, urban legends persist that make stronger assertions. These include claims that 'mole people' have formed small, ordered societies similar to tribes, numbering up to hundreds of people. It has also been suggested that these have developed their own cultural traits and even have electricity by illegal hook-up. The subject has attracted some attention from sociologists but is a highly controversial subject due to a lack of concrete evidence. ...more on Wikipedia about "Mole People"
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