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Many years of experience combined with a skilled team have ensured that Unionbau is now the specialist in underground engineering and tunnel construction. Our numerous road, bridging and tunnel projects are a recurring contribution in making sure that people to get from A to B, reliably, faster and more comfortably. We are supported in this work by a network of outstanding partners, engineers and geologists. With them we can execute highly complex special underground engineering or tunnel construction tasks in a reliable and expert manner.