The physics of putting a heavy crane on a ship and pulling up ships fascinates me.
How do they keep from capsizing?
Smithsonian used to have a show called Great Ships or Mega Ships or something. One of the ones they featured was the world’s heaviest lift cargo ship. They had outriggers that they deployed from the opposite side to counteract the weight. Using two onboard cranes they would inch the giant loads on board adjusting the outriggers and ballast tanks on the ship with every move.
I’d want to use two. One on each side of the lift.
There are tanks that are flooded with water to give it weight opposite the lift or water is pumped out to give it bouncy on the side with the lift.
The pumps are big enough that they will flood or drain the tanks even with the load being swung from one side of the ship or barge around to the other side.