"We don't have a 90 degree angle here".

Even for experienced construction professionals, this is a construction site of superlatives: 1,900 meters above sea level, a new double-curved arch dam is being built on the Grimsel in the Bernese Oberland over seven construction seasons. Starting in the fall of 2025, it will replace the 90-year-old existing wall, which keeps the almost 100 million cubic meters of water in the Grimsel reservoir in dams - and has a crack.

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