This appears to be the drone in question.

https://www.unmannedsystemstechnology.com/2019/06/ai-powered-mine-hunting-auv-under-development-for-royal-navy/

That boeing drone? Interesting.

My guess is the charge was placed awhile ago. Maybe even during it's creation.

Also I believe the pipeline wasn't even bombed. Just a bomb went off nearby it.

I blame biden seriously fuck that guy.