* 2003 – An electricity blackout cuts off power to around 500, 000 people living in south east England and brings 60 % of London's underground rail network to a halt.

The capital Sofia also has a tram and an underground network.

This is particularly so in Sydney and Melbourne, where headways on many lines in the core of the network reach 3 – 5 minutes in peaks and 10 – 20 minutes off peak ( about 18 hours a day ) and enter an underground loop for passenger distribution in the city centre ; and where ridership per capita exceeds the sum of metro and commuter rail in comparable North American urban areas such as Toronto, Boston or the San Francisco Bay Area.

This success was largely driven by the network of underground fanzines, the most important and far reaching of which were Extraordinary Sensations, produced by future radio DJ Eddie Piller, and Shadows & Reflections, published by future national magazine editor Chris Hunt.

In November 1961 in Fortune magazine, an article by Gilbert Burck appeared that outlined the plans of Nelson Rockefeller, Edward Teller, Herman Kahn, and Chet Holifield for an enormous network of concrete lined underground fallout shelters throughout the United States sufficient to shelter millions of people to serve as a refuge in case of nuclear war.

In some cities the distinction between U-Bahn and S-Bahn systems is blurred, for instance some S-Bahn systems run underground, have frequencies similar to U-Bahn, and form part of the same integrated transport network.

Kosiński's father received help not only from town leaders and churchmen, but also from individuals such as Marianna Pasiowa, a member of the underground network helping Jews evade capture.

Throughout the Civil War, the Confederacy maintained a network of underground operators in southern Maryland, particularly Charles and St. Mary's counties, smuggling recruits across the Potomac River into Virginia and relaying messages for Confederate agents as far north as Canada.

Many of the buildings are connected above ground as well as through an extensive network of underground tunnels, providing protection from the Cambridge weather as well as a venue for roof and tunnel hacking.

The petits ouvrages were generally made up of several infantry bunkers connected by an underground tunnel network to which were attached various buried facilities, such as barracks, electric generators, ventilation systems, mess halls, infirmaries, and supply caches.

These were composed of at least six " forward bunker systems " or " combat blocks ", as well as two entrances, and were interconnected via a network of underground tunnels that often featured narrow gauge electric railways for transport between bunker systems.

At the same time, with the underground network of Montoneros militants largely uprooted in the capital of Tucumán province, several hundred ERP militants took the streets in the Argentine city of Córdoba in the last week of August 1975, in an effort to divert attention from the military operations being waged in the jungles and mountains of Tucumán and five policemen were killed as a result, after the police headquarters was attacked with gunfire and the police radio communications center bombed.

New U-Bahn and S-Bahn lines were planned to run directly beneath almost the whole length of the axis, and the city's entire underground network reoriented to gravitate towards this new hub ( at least one tunnel section, around 220 metres in length, was actually constructed and still exists today, buried some 20 metres beneath the Tiergarten, despite having never seen a train ).

What is now a single network of lines controlled by a single organisation began as a collection of independent underground railway companies that constructed lines in the 19th and early 20th centuries.

The Romans connected the river with a sewer system ( the Cloaca Maxima ) and with an underground network of tunnels and other channels, to bring its water into the middle of the city.

* London Underground, responsible for running London's underground rail network, commonly known as the tube, and managing the provision of maintenance services by the private sector.

Alone and hunted, SEN makes a tentative exploration of the limits of the city's underground network.

Pursued by two police androids on motorcycles, THX in his car flees to the limits of the city's underground road network.

While an " underground railroad " running south toward Florida, then a Spanish possession, existed from the late 17th century until shortly after the American Revolution, the network now generally known as the Underground Railroad was formed in the early 19th century, and reached its height between 1850 and 1860.

The escape network was not literally underground nor a railroad.

Japanese knotweed has a large underground network of roots ( rhizomes ).

In Burma, VCDs are the medium of an underground video network that largely stays beneath the sights of the military regime, although VCD trends are reported on by expatriate newspapers.

The word has survived in common usage today only to define a place where rabbits breed and live, thus a network of underground interconnecting rabbit burrows, and by analogy an overcrowded place or building.

In 1983, the VAL, the world's first automated rapid transit underground network, was opened.

* In 2003, an Australian coal miner amputated his own arm with a Stanley knife after it became trapped when the front-end loader he was driving overturned three kilometers underground.

In the late 1960s and early 1970s a surge of creativity emerged in what became known as underground comics.

The remnants of CPSU became the Union of Communists of Latvia, which went underground.

In addition to the obscenity lawsuit and being ignored by the mainstream media ( MTV and most radio stations gave such groups scant notice, not to mention airplay ), the band became increasingly disillusioned with the underground scene as well.

Born into a working-class family, from an early age Ortega developed a hatred of the ruling President Anastasio Somoza Debayle, who was widely recognized as a dictator, and became involved in the underground movement to oppose Somoza's regime.

The tunnels became a great and complex system of underground fortifications which nowadays criss-crosses the inside of the Rock.

As a figure of 19th century fairy tales, the term gnome by the 20th century became largely synonymous with other terms for the " little people ", such as goblin, brownie, kobold, leprechaun, Heinzelmännchen and other instances of the " domestic spirit " type, losing its strict association with earth or the underground world.

In 1982, Marrow met producer William Strong from Saturn Records, who recorded his first single, " Cold Wind Madness ", also known as " The Coldest Rap ", which became an underground success, becoming popular even though radio stations did not play it due to the song's hardcore lyrics.

In the early 1980s, Jarmusch was part of a revolving lineup of musicians in Robin Crutchfield's Dark Day project, and later became the keyboardist and one of two vocalists for The Del-Byzanteens, a No Wave band whose sole LP Lies to Live By was a minor underground hit in the United States and Britain in 1982.

Soliah went underground and became a fugitive for 23 years.

While punk rock remained largely an underground phenomenon in North America, Australia, and the new spots where it was emerging, in the UK it briefly became a major sensation.

They became " the reigning kings of American underground rock, for a few years ".

On the other side, hardcore punk, Oi !, and anarcho-punk bands became closely linked with underground cultures and spun off an array of subgenres.

Later, when he had honed his skills, he became a " road gambler ", a traveling hustler who became an underground legend by winning at all manner of propositions.

The song Destiny became a huge hit in the underground circle.

Artists in Berlin became fused with the city's underground culture as the borders between cabaret and legitimate theatre blurred.

" Walking on Thin Ice ( For John )" was released as a single less than a month later, and became Ono's first chart success, peaking at No. 58 and gaining major underground airplay.

In the early years, the underground sound became more mainstream.

Before the 1970s, dancers of both sexes appeared largely in underground clubs or as part of a theatre experience, but the practice eventually became common enough on its own.

" Smuggled into England, the libel became a best-seller with underground booksellers and the next year was translated into French.

In the Bay Area he became involved with the publishing and cultural underground, writing reviews and critiques of the “ marginals ’ milieu ”.

The town became one of the crucial centres of recruitment and activity of the militant anti-fascist organization TIGR, which carried out an underground fight against the Italian Fascist regime.

Opened in the late 18th century, the underground cemetery became a tourist attraction on a small scale from the early 19th century, and has been open to the public on a regular basis from 1874.