Spaceguy5 t1_ivzu0k8 wrote
Reply to comment by Schnort in NASA leaders recently viewed footage of an underwater dive off the East coast of Florida, and they confirm it depicts an artifact from the space shuttle Challenger by marketrent
True, could have been erosion and ocean currents wearing them down as well.
The inside of the tiles is pretty much a foam like texture (extremely porous), except it's hard and made out of silica. And then they would add either a white or a hard black coating on the outside
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