Pretty sure I found a piece of Challenger. I was at Cocoa Beach about 9mos after and found a piece of metal about 12 inches long and 12 inches wide. It was literally ripped in the middle and had burn holes in the metal, almost as if a cigerette was able to burn through.
If I had to guess it’s titanium. But I’ve never had it tested and have been toting it around all of these years