in june 2022, three months before the attack, that six members of Ukraine’s special operations forces were going to rent a boat and use a submersible vehicle to dive to the seabed using oxygen and helium for breathing, in order to sabotage the pipeline.
In July (one month later, 2 months before the attack), the UN security council heard investigators had found traces of undersea explosives in samples from a yacht, but that they were unable to reliably establish the identity or motives of those involved or whether it was the work of a specific country.