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Maastunnel Rotterdam
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Ventilation building and at the right the small entrance building for cyclists and pedestrians. The Maastunnel was built (1937-1942; architects J.P. van Bruggen and A. van der Steur) using the sunken tube or immersed tube method. Separate parts of the Maastunnel were built elsewhere in a dry dock, and then floated into place and sunk into a trench dug in the river bottom, a technique used in many other Dutch tunnels after the Maastunnel. The Maastunnel was the world's first rectangular shaped underwater tunnel build in this way. For The Netherlands it was the first car tunnel. The underground part connecting the banks of the Nieuwe Maas is 1070 metres long with 2 tubes for cars, 1 tube for cyclists and 1 tube for pedestrians.
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