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Presumably, the thinner parts of the ceiling are weaker. Weak enough to break under the weight of a human body (I'm not about to test this)? Pieces of rock have broken off over time and are sliding down the slope.
Presumably, the thinner parts of the ceiling are weaker. Weak enough to break under the weight of a human body (I'm not about to test this)? Pieces of rock have broken off over time and are sliding down the slope.