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Enormous cavern below major Toronto intersection is getting even bigger

Construction has reached a fever pitch on the downtown Toronto stretch of the future $27 billion Ontario Line subway.The new transit line will relieve existing subway interchanges with a 15-station, 15.6-kilometre route between Exhibition Place and the shuttered Ontario Science Centre — including a six-kilometre underground section between Exhibition Place in the southwest and the Don River in the east The stations being constructed along this tunnelled section are among the most complex and expensive on the line, involving unique construction methods and intensive subterranean mining, all without disrupting the already-chaotic downtown traffic situation.Metrolinx recently shared a fascinating update on the future King-Bathurst station, where crews have been working to excavate a cavernous void below the stop's namesake intersection since last year.The vast hollowed-out space being mined below King and Bathurst, known as the north site cavern, recently crossed an impo...


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