Montreal's transit authority says the cracks inside the metro tunnel that forced the closure of a large portion of the green line on Monday were initially detected more than a week earlier

https://www.iheartradio.ca/cjad/audio/montreal-s-transit-authority-says-the-cracks-inside-the-metro-tunnel-that-forced-the-closure-of-a-large-portion-of-the-green-line-on-monday-were-initially-detected-more-than-a-week-earlier-1.19585511