I think I know that or I wouldn't have suggested that the find the leak and seal it or drill drain holes to clear the water out or both. Actually water is 2 parts hydrogen and 1 part oxygen (H2O) so without that oxygen there would be no water. However, if additional oxygen is not introduced the erosion is much slower. Therefore you can find 100 year old cannons fairly well preserved until they are taken out of the water and then they must take special steps to stop massive oxidation. If the frames were not deteriorated to the point of weakness then the frames didn't deteriorate. Of course, we have no idea how long the water had been in the frame, that would make a difference and that will remain an unknown factor.