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Abstract: The Söderströmstunneln is one of the most challenging parts of the new Citybanan, a 6 km long railway tunnel crossing the ancient centre of Stockholm. Major parts of this underground link can be executed using the common drill and blast method. But this does not apply to the 450m long immersed Söderströmstunnel crossing the Söderström, connecting the islands Riddarholmen and Södermalm. Unique...