If it s an overhead mountain collapsing colonists will be buried alive. So i try to remove the mountain roofs so they don t collapse by declareing a no roof area but on some tiles it will never be possible to declare that area and if i let the roof collapse and remove the debris it just collapses again presumably forever since i tried removing it 15 times and it still collapsed. Drawing a remove roof zone will cause colonists to remove a. 
				
			
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