Stating: “hook a gigantic ship up to another gigantic ship” isn’t something that is going to be done in some simple fashion even if it is at all possible, taking into count the forces that would be introduced to both ship’s anchoring points. The chains would need to be equally taut distributing the force in an as equitable way as possible so who knows if it is even feasible?
Obviously, it would have to be the ships lined up to the aft of the stuck ship that could be brought into service as giant tugs.
When you are a professional know it all anything is possible. High five! ;0)
The structure of the ship isn’t likely strong enough to be able to hold that much tension. The cargo would have to be unloaded, and it still would be a monumental task............
They would probably be quicker to dredge around the ship, and I would call for high pressure pumps to pump massive amounts of water underneath the ship to loosen the mud, like a dozen or more fire engines....................