Critical damage needs to be stabilized. The strongest sections of the hull are the extreme ends. This stress is caused by uneven support from below the bottom plates, the overhead weight, the list of the hull, deterioration due to rust and wave action, and the scuttling damage from 26, which has obviously grown worse. Areas approaching collapse need to be shored-up. This shoring is done with screw jacks, plates and knees.
Underwater welding is a necessity, of course.
Determining exactly where to place reinforcing structure can only be done after a thorough survey of the ship and sea bed. After the survey is conducted, preparations for repairs and raising must quickly proceed. Cerberus is a breakwater. The water is breaking Cerberus instead, and will certainly be a threat to all working near the hull. Cerberus needs to be replaced as a breakwater for the duration.