For smaller salvage operations, salvage tubes (basically balloons) are often used to raise the ship off the bottom. I suspect it's impractical due to the immens

For smaller salvage operations, salvage tubes (basically balloons) are often used to raise the ship off the bottom. I suspect it's impractical due to the immense mass of this ship, but part of me wonders how large of a balloon you'd need to stick under the bow and stern to refloat it.