Posted by mookster A cracked wall.
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Thanks for giving me the opportunity to wander through some old pics! This was one of the first places I ever explored, and surely the worst crack even to this day. This one runs so deep that bedrock gas is either depositing a precipitate onto the wall (gas from a natural sulfur vein, maybe?) or discoloring the wall due to something else (radon?).
A trophy - literally or figuratively