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Abstract: Within the scope of the 2nd Coen Immersed tunnel project, the refurbishment of the almost 50 years old 1st Coentunnel was comprised. As two immersion joints showed leakage problems, an analysis was made to detect the causes that led to these leakages and the appropriate mitigating measures that should be implied. This analysis resulted in the decision to ‘only’ take care of the evacuation of...