Military can provide manpower.
In the meantime, 1000 American soldiers are building a port to supply the damn Muslims in Gaza.
There is no purpose in dragging the debris away - that will just make it worse, as pieces will randomly break off.
The whole thing is unstable. Commercial divers have to go down and find places to attach lifting cables, visibility likely zero. Very dangerous. Pieces have to be removed systematically. Depths in the channel range from 40-50 feet - other area are shallower.
There is no quick and dirty solution.
Building a temporary dock, aka port, is a totally difference kettle of fish.