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Geological Survey of Norway (NGU)

It is not that easy to build tunnels in Norway. History tells us there have been many problems with unstable rock masses and water leakage. Aerial surveys are the new way forward for identifying where the problem areas lie, and these surveys should be conducted before planning the construction of a tunnel. Research shows that tunnel problems in Norway are often due to tropical weathering of bedrock that occurred when dinosaurs roamed the land.

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