The Blue Line extension project of the Montreal metro aims to transform mobility in the city's east end by enhancing public transit connectivity and appeal. Estimated at nearly $7 billion, this large-scale project involves the addition of five new stations and the excavation of a 6-kilometre tunnel, connecting Saint-Michel station to the borough of Anjou. Delivering the project requires navigating numerous challenges, including technical complexity, urban integration, market conditions, political sensitivity, and multi-stakeholder governance.