Capture of the individuals behind it? Perhaps not. Identifying the vessel(s) supporting the sabotage operation? Much more likely.

Possibly. I agree that it's possible, but not inevitable. That's assuming even that stopping, diving, attaching explosives was the method.

Someone upstream suggested dragging explosives along behind the boat like an anchor, detonating when detecting the steel and concrete of the pipe. Wouldn't need scuba gear, nor even to stop.

It doesn’t take much more sophistication to place these weeks ago with a timer. And a bit more tooling and you can place them and remotely detonate when needed.