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Norway played a significant logistics and intelligence role in assisting an elite US Navy deep-diving team of divers based out of Panama City to carry out the operation:
Sometime in March, a few members of the team flew to Norway to meet with the Norwegian Secret Service and Navy. One of the key questions was where exactly in the Baltic Sea was the best place to plant the explosives. Nord Stream 1 and 2, each with two sets of pipelines, were separated much of the way by little more than a mile as they made their run to the port of Greifswald in the far northeast of Germany.
The Norwegian navy was quick to find the right spot, in the shallow waters of the Baltic sea a few miles off Denmark’s Bornholm Island. The pipelines ran more than a mile apart along a seafloor that was only 260 feet deep. That would be well within the range of the divers, who, operating from a Norwegian Alta class mine hunter, would dive with a mixture of oxygen, nitrogen and helium streaming from their tanks, and plant shaped C4 charges on the four pipelines with concrete protective covers. It would be tedious, time consuming and dangerous work, but the waters off Bornholm had another advantage: there were no major tidal currents, which would have made the task of diving much more difficult.
Hersh's sources underscore that the order came directly from President Biden's office:
The C4 attached to the pipelines would be triggered by a sonar buoy dropped by a plane on short notice, but the procedure involved the most advanced signal processing technology. Once in place, the delayed timing devices attached to any of the four pipelines could be accidentally triggered by the complex mix of ocean background noises throughout the heavily trafficked Baltic Sea—from near and distant ships, underwater drilling, seismic events, waves and even sea creatures. To avoid this, the sonar buoy, once in place, would emit a sequence of unique low frequency tonal sounds—much like those emitted by a flute or a piano—that would be recognized by the timing device and, after a pre-set hours of delay, trigger the explosives.
…On September 26, 2022, a Norwegian Navy P8 surveillance plane made a seemingly routine flight and dropped a sonar buoy. The signal spread underwater, initially to Nord Stream 2 and then on to Nord Stream 1. A few hours later, the high-powered C4 explosives were triggered and three of the four pipelines were put out of commission. Within a few minutes, pools of methane gas that remained in the shuttered pipelines could be seen spreading on the water’s surface and the world learned that something irreversible had taken place.
The allegations were quickly picked up by The Times (UK), Reuters, and others - including Russian state media, prompting the White House to swiftly issue a rebuttal:
The White House said on Wednesday that a blog post by a U.S. investigative journalist alleging the United States was behind explosions of the Nord Stream pipelines "is utterly false and complete fiction."
https://www.zerohedge.com/geopolitical/nord-stream-sabotage-was-cia-us-navy-covert-op-seymour-hersh-bombshell-prompts-white