Rapid transit in the United Kingdom consists of four systems in three cities: the London Underground and Docklands Light Railway in London, Tyne and Wear Metro in Newcastle upon Tyne, and the Glasgow Subway.
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THE world's deepest metro system is the Pyongyang Metro in North Korea which is 110 meters deep. The tunnel was built as part of an underground military facility. THE world's deepest metro, underground station is the Arsenalna Station on the Kiev Metro in Ukraine, at 107 meters deep.
Subterranean London refers to a number of subterranean structures that lie beneath London. The city has been occupied by humans for two millennia. Over time, the capital has acquired a vast number of these structures and spaces, often as a result of war and conflict.
the centre of London is North of the Thames. there was already a dense network of surface railways around inner South London by the time underground railways started to be built, so there was less reason to build underground ones. the clay soil of South London was not suitable for early tunnelling methods.
The London Underground first opened as an underground railway in 1863 and its first electrified underground line opened in 1890, making it the world's oldest metro system.
At that time geological surveys were conducted and it appeared that the nature of the soil would make tunneling particularly difficult in Moscow. Many underground rivers were discovered. It was safer to dig tunnels deep under the ground level. The depth of the tunnels usually ranges from 35-55 meters.