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View Full Version : Ottawa sinkhole struck in unstable 'rock valley' flagged by engineers


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06-09-2016, 09:09 AM
http://i.cbc.ca/1.3623336.1465430054!/cpImage/httpImage/image.jpg_gen/derivatives/16x9_460/road-collapse-20160608.jpg The sudden road collapse that left a gaping hole in the middle of Rideau Street in Ottawa Wednesday morning occurred over a vein of sand, silt and fractured rock so volatile workers completing the light rail tunnel below had to inch along cautiously for fear of causing a cave-in.


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