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Massive cavern forming below major Toronto intersection looks like a mine

A large void is being carved out below a major Toronto intersection traversed by thousands every day, and few people passing overhead have any idea that a huge cave lurks below as part of the push to build the new $27 billion Ontario Line.When it opens to the public in 2031, the new 15-station, 15.6-kilometre transit line will relieve existing subway interchanges by providing a route between Exhibition Place and the shuttered Ontario Science Centre.That route includes a tunnelled stretch through the heart of downtown Toronto, requiring deep underground excavations at station sites in preparation for the arrival of tunnel boring machines.The future Ontario Line Queen-Spadina subway station will be one of the stations requiring the excavation of "caverns" deep below street-level, and Metrolinx has provided an update on the major operation hidden out of sight underground.The transit agency shared new photos celebrating "a big month underground" in February, noting t...


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