“How America took out the Nord Stream pipeline”

I once read (Don DeLillo?):

The John F. Kennedy assassination could not have been a conspiracy, some conspirator would have spoken sooner or later (maybe on his/her death bed).

This is obviously not a lone perpetrator, so the truth will come out.

But it may take decades, e.g.:

https://en.wikipedia.org/wiki/Gulf_of_Tonkin_incident

Maybe not today with the internet and the speed at which this stuff gets out. Things get hacked and documents leak digitally which is way easier than someone breaking into a physical building and riffling through old documents. Additionally as we have seen with Trump, Biden and Pence it appears that the way the administration deals with secret documents can be quite sloppy.