After years of ambiguity surrounding early issues with the Scarborough subway extension tunnel, newly released documents confirm it took several months to fix the tunnel-boring machine as it sat stationary near Highway 401.

The details were contained in a freedom of information request filed and released by the Ontario NDP on Wednesday. The internal documents were from late 2024 and early 2025. Much of the 493-page response from the Ontario government was redacted, citing reasons such as non-responsiveness, “settlement privilege,” economic interests and advice to the government.

As the documents noted, tunnelling by Strabag began in January 2023 (which was “slightly behind their original schedule) and it was supposed to be substantially completed by October 2024. Original projections had

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