[Cletus.D.Yokel]

Valves are both manual and SCADA (hydraulic).

Takes 4 to manually close a valve on 1000 psi in a 36-inch line.

Not familiar with Nord-line size.
Plus...you would need divers 😊

[LonePalm]

Nord Stream is a 48" pipe.

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)