This was reported by Tagesspiegel with reference to sources in the government.
It is noted that if the pipelines are not repaired quickly, large amounts of salt water will enter the pipelines and corrode them.
German security authorities and the BND federal intelligence service suggest that the gas pipelines were damaged as a result of an act of sabotage. It is assumed that this could have been done by the Russian side, but the motive remains unclear.
One theory is that divers may have planted explosives in two Nord Stream 1 pipes and one of the two pipes of the decommissioned Nord Stream 2 pipe.