Construction for the Scarborough Subway Extension continues as crews dig even deeper to build the massive excavation needed for the project’s very large tunnel boring machine.
Building a new subway tunnel in the heart of Scarborough is a complex undertaking – the launch shaft alone will be about 80 metres long, 30 metres wide, and 25 metres deep. For comparison, a standard Olympic-sized swimming pool is about 50 metres long, 25 metres wide, and 2 metres deep.
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https://blog.metrolinx.com/2021/10/07/digging-deep-on-the-new-scarborough-subway-extension/amp/
