only a handful of investigators at most have been assigned to work on the Nord Stream case on a full-time basis.
the perception among investigators is that the will to solve the case is not particularly pronounced in the capital. Politically, it is easier to live with what happened if it remains unclear who is behind the attacks.
obviously with the support and assent of the US, but it is a funny counterfactual if the US posturing had actually been to politically pressure the end of Nordstream & it actually fucked up the plan when rogue ukrainians blew it up