There’s some additional “repair” discussion over at ‘New Civil Engineer’.
Link and small extract follow:
“…Since the explosions and the subsequent leaks, German authorities have stated the ruptures in the pipes may not be repairable.
Chair of the Offshore Engineering Society Philip Cooper told NCE that is not the case.
He said: “It’s definitely repairable in some form. The original Nord Stream used hyperbaric welding systems to create it and it is exactly the same equipment you would use to repair it.
“Any big lifeline always comes with a repair plan. You can do all this stuff diver-less now. At the very minimum there should be some preservation measures. As sea water enters the ruptures corrosion will start. The protection on the outside doesn’t help inside so much.”…”
Thanks for the link! Corrosion was my first initial concern regardless of the “how” to repair. Unless the steel is T316 stainless, it will corrode quickly in salt water.