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Safe drilling in rock-hard soil

Liquid nitrogen helps during extension of Budapest’s underground rail system

Second only to the “London Underground”, “Metro Budapest” is Europe’s oldest subway system.

Construction of its fourth line began in January 2009: a 7.4-km tunnel under the Danube was completed to connect Buda with Pest. Two tunnels with train platforms were also built at the stop‚ Fvám tér, under the Danube. Prior to drilling, the section of soil in the upper part of the tunnel was frozen with liquid nitrogen to stabilise it and prevent infiltration of water. A total of two million cubic metres of nitrogen were required before the Hungarian project was completed in April 2010.

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