I think they could just drag a suitable hook behind a ship to carve out decent trench.
Geez, how are we so much better at this than the actual engineers?
Edit: to parent comment, I think people missed your joke.
Geez, how are we so much better at this than the actual engineers?
Edit: to parent comment, I think people missed your joke.
[1] https://www.youtube.com/watch?v=XQVzU_YQ3IQ&t=50s [2]
[2] There are far better videos that show this, but I'm on mobile and not going to find it right now.