Eastern Europe tunnels tenders

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A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.

Eastern Europe is the eastern region of Europe. There is no consistent definition of the precise area it covers, partly because the term has a wide range of geopolitical, geographical, ethnic, cultural, and socioeconomic connotations. Russia, located in Eastern Europe, is both the largest and most populous country of Europe, spanning roughly 40% of the continent's total landmass, with over 15% of its total population. According to the Center for Educational Technologies at Wheeling Jesuit University, there are "almost as many definitions of Eastern Europe as there are scholars of the region". A related United Nations paper adds that "every assessment of spatial identities is essentially a social and cultural construct". One definition describes Eastern Europe as a cultural entity: the region lying in Europe with the main characteristics consisting of East Slavic, Greek, Byzantine, Eastern Orthodox, and some Ottoman cultural influences. Another definition was created during the Cold War and used more or less alike with the term Eastern Bloc. A similar definition names the formerly communist European states outside the Soviet Union as Eastern Europe. Such definitions are often seen as outdated but they are still sometimes used for statistical purposes. Countries in eastern europe, Belarus, Bulgaria, the Czech Republic, Hungary, Moldova, Poland, Romania, Slovakia, Ukraine and the western part of the Russian Federation.