I understand that the Belvedere was also coated in Cosmoline before interment. I've worked with old suspension pieces coated with this stuff from the factory, and they're usually in okay shape-this on Midwestern salt exposed cars. This may have helped preserve the metal some. I bet you they'll show this on the evening news.
I read in another forum that Tulsa, while being "dry", is prone to flooding, rather like a Texas flood. This probably caused the flooding.
I was reading on yet another forum (different from the one mentioned above) and I'm surprised at the number of people who are either A.) upset at the percieved waste of time and money, B.) whining that the car was "a piece of junk" then and is moreso now, or C.) going "I could've done a better job than those bozos". I realize that some people just wont "get" something like this but I was surprised to see such a concentration of them in one spot. Distressed, even.