Back to the question about unloading cargo containers. Each container has a specific weight and are loaded in a set pattern. Once you start removing containers you affect the Stability and Buoyancy of the vessel. A shift in the Center of Gravity of the vessel will cause it to capsize or roll over on its side. Look at the one in Georgia which is being cut into pieces. It ran aground, cargo shifted and capsized. They elected to cut it into pieces to clear the area, that was almost a year ago they started cutting.
In the Navy when you take battle damage on the ship, there is a lot of math involved to figure out which compartments to counter flood or how to dewater to keep the ship stable and buoyant. I believe they have a computer to help now but back in the late 90's it was done by hand and a pain to figure out.
It would be along those same principles figuring out which container to move to not affect any of the other containers from shifting weight and causing the roll over.
Reading on Stability:
https://www.wartsila.com/encyclopedia/term/stability