[PoignardAzur]

> I also very much doubt it was the Ukrainians in by themselves - as blowing up heavily reinforced pipes 80m under the water is a rather extreme task, but at least they would have had a reasonable motive.

I agree with the first part of your comment, but it baffles me that people keep claiming "Sending some divers from a small yacht plant a bomb underwater" would beyond the capabilities of the Ukrainian special forces.