Wish I were closer.
Down here in hurricane
alley, we get practice refloating sunk boats. I have several commercial
type flotation bags which you put in various parts
of the boat, then inflate them. You can use scba tanks
or an air compressor
. Placing the uninflated bags is hard work, plus they must be placed so they will lift
the boat evenly.
I have used a Harbor Freight, oilless compresser, powered by a cheapo two stroke generator
, slow but it works.
Be sure the divers are in a safe location because when the suction breaks, they can come up fast.