Quote: Looks like there was a tank of gas that was left outside the bag. Could be what's floating around in the water and not the fluids from the car.
The car was buried with a can of gas and some oil in case they were not availible here in the future . If those were outside the car and its cover, they could easily be the source of the slick on the water.
Something that has not been addressed is the mud in the vault. Assuming the cover did in fact leak, if some of that clay mud seeped in and coated the car, I would think it would actually help protect it.
Remember when they raised the U.s.s. Cairo in the 60's? It was encased in mud and was well preserved... until they tried to raise it.
I dunno, just I thought, keeping my fingers crossed...