fill the emptied fuel tanks with the balls. the ones they pushed sea water into to get the fuel out.. that in it's self has to be a huge amount of displacement and should allow the ship to float once again. Just like in diving there would have to be a way to let some of displacement out as not to rise to fast and flip the ship. Diving 101. Inflate BCD to surface. as you rise let some of the expanding air out of the BCD as not to rise to fast. Keeping in mind that other compressed objects IE: Cushions will become more buoyant as the ship rises. there also has to be laser guides along the hull of the ship to make sure it doesn't twist. and the ship looks so close to the shore you could use a couple of cranes to attach to the top of the ship to make sure it stays upright as it is raised. An even better idea is to use that expanding foam crap. the same stuff they shoot under houses to and concrete to level them. it will cure under water. stays where you put it and expands an extreme amount displacing a lot of water.
