A German newspaper is also implying a Ukraine connection to the Nord Stream pipeline sabotage:
https://www.zeit.de/politik/ausland/2023-03/nordstream-2-ukraine-anschlag
Interesting how these stories are breaking on the same day. Almost seems like a coordinated leak of raw intelligence.
This German report seems to be the work of four newspapers/news organization based, as far as I can tell, on their own investigation. I don't see any sources from any intelligence agency in the story, any leaks.
Key graft (google translation): "Specifically, according to information from the ARD capital studio, the investigators are contrasts [??], SWR and ZEIT managed to identify the boat that was allegedly used for the secret operation. It is said to be a yacht rented from a company based in Poland, apparently owned by two Ukrainians. According to the investigation, the secret operation at sea was carried out by a team of six people. It is said to have been five men and one woman. Accordingly, the group consisted of a captain, two divers, two diving assistants and a doctor, who are said to have transported the explosives to the crime scenes and placed them there. The nationality of the perpetrators is apparently unclear. The assassins used professionally forged passports, which are said to have been used, among other things, to rent the boat."
Hell, it could have been Polish intelligence?