Maastunnel

Maastunnel

The Maastunnel is a tunnel in Rotterdam, the Netherlands, connecting the banks of the Nieuwe Maas. About 75,000 motor vehicles and a large number cyclists, mopeds and pedestrians use the tunnel daily, making the Maastunnel an important part of Rotterdam's road network. Building commenced in 1937 and finished in 1942.

Construction of the tunnel was preceded by years of animated discussions. Although there was agreement as to the need for a new permanent connection between the two banks of the Maas river, there was lack of agreement as to whether it should be a bridge or a tunnel. A tunnel proved to be more attractive financially than a bridge, largely because of the great height a bridge would have needed to avoid hindering the passage of ships from the port of Rotterdam, the largest port in Europe.

The Maastunnel was built 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. Each of the nine parts of the tunnel has a length of over 60 metres, a height of 9 metres and a width of 25 metres. They contain two adjacent tubes for motorised traffic, and two piled tubes for mopeds, cyclists and pedestrians next to it (accessible by escalator). At one time there was a laboratory in one of the ventilation buildings to examine the air quality in the tunnel.

The Maastunnel was opened to the public on February 14 1942 and was the first car tunnel in the Netherlands. At the end of the Second World War overhead lines were installed to allow for the passage of trolleybuses. Although two buses were ready for these experimental rides, they were never used for public transportation in Rotterdam. In 1944 the Germans invaders placed explosives in the tunnel so they destroy it at a moment's notice. Perhaps due to the sabotage of the detonators (the overhead lines) by the Dutch resistance the explosives were not detonated.

The length of the Maastunnel is 1070 metres (including access roads). The underground part is over 550 metres long. The lowest point of the tunnel is approximately 20 meters below sealevel. Above ground, the tunnel's location can be recognized by its characteristic ventilation buildings on both sides of the river. It can be seen from the nearby Euromast tower as well.

=External links=
* [http://maps.google.com/?ie=UTF8&z=19&ll=51.89741,4.468429&spn=0.000952,0.002924&t=h&om=1 Satellite image of the south ventilation building]


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