A unique underground network is created in Doha, Qatar. With a total of 111 km, the project is one of the largest in the world and its realization is due to 21 tunnelers Herrenknecht.
After 26 months of construction work supervised by Qatar Rail, the last breakthrough was made on September 25, 2016. Twenty-one tunnel boring machines were necessary to concretize this mega project of 3 metro lines.
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