This is quite the salvage operation that will take until spring before the vessel will be towed away to the scrapyard. They are using a process called “parbuckling” to right the ship. This was the same method used to right the USS Oklahoma in Pearl Harbor and tried on the USS Utah but failed because it started sliding away as they tried rolling it.
On the Concordia they built an underwater platform under the ship on the reef for it to rest onto when its rolled upright and to keep it from sliding away during the roll process. They had to roll it 65 degrees. If you look at the pictures you”ll notice these big square like boxes on the side that was out of the water. Once the ship was roled 28 degrees those boxes were filled with water and the weight helped roll the ship the rest of the way upright. Now that it’s upright they will be welding the same boxes othe side that was underwater. when that is done they will then be pumped out to refloat the ship for towing.
Pretty dang good idea. Counter balances can work when done right. I did notice it rolled pretty nicely once they got to the half point.