It will be interesting to see what they do in the short term. My uneducated guess is that they cut in to smaller pieces that can be partially floated and drag the pieces of the bridge away from the channel.
This advice is free by the way. Worth much more for sure.
Smaller pieces, like reducing them to 50 tons. Usually hard hat commercial divers are lowered into the water from a very large barge. The whole project will be set out for bid.
Divers attach cables lowered from the barge’s crane, which are then raised and placed on the barge, where they are cut up to make room for more. When the barge is full they go in to unload & get ready for the next day.
Dragging pieces will only make things worse, as parts will break off, and someone has to go back and find them in the murky frigid water. Compounding the cost, the danger to the divers, and to recovery.
Commercial salvage companies are set up for this sort of work; the bigger ones do salvage like this worldwide. The US military is not set up for this kind of work; it would destroy the Pentagon’s budget over many years.