The basis of the construction of a tunnel that has already been used, there are two categories of General.The tunnel excavation and fill up 1. Built in a shallow Groove in the upper laeoklop2. the tunnel drilling. Create a job site without the need to demolish the ground above the page, cut out a circle or its.The current tunnel is created in the tube as the tube by tube on the side and then placed on the seabed or buried beneath the sea floor tuen.
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