Did you read your link? The authors apparently know nothing of diving or boating. They also make the mistake of assuming that tons of explosives were needed for the sabotage. They also stated that it would be difficult to find the pipelines, which is simply not true.
Another problem, cited by the press, was that at the site of the explosion, the Baltic Sea is about 80 meters deep, requiring special diving equipment including a decompression chamber for the divers – something that the yacht is not fit for. ...
For instance, the expert pointed out that one cannot just walk off the street and rent an expensive yacht with a fake passport. “You either need to accept a captain who was supplied by the leasing agent or owner of the yacht, or have a captain who comes with a certificate of competency as mandated by maritime law,” the expert continued.
Another question is how the Andromeda managed to find the pipelines in the Baltic Sea, given that they are not that big and not on the charts that come with the lease. Having a small yacht and two divers, who could stay about 15 minutes under water, it would take four years to search one square mile, Hersh wrote, citing the expert.
“So you have six people on the yacht—two divers, two helpers, a doctor and a captain leasing the boat. One thing is missing – who is going to crew the yacht? Or cook? What about the logbook that the leasing company must keep for legal reasons?” the expert continued, stressing that no Western journalist ever asked any of those questions. What’s more, it appears that none of them has ever set foot on the much-discussed vessel.