according to a third party conversation with a senior CT official, "very long term plans do contemplate a subway through the city centre. One recently built or renovated government building has a provision for a future station in its basement." This building is alleged to be the convention centre. However, a subway was begun in Calgary in the 1980's. The section below City Hall has been visited by urban explorers. The tunnel goes under the CP rail tracks south of 9th Ave. downtown. This tunnel in use and has a stub (the "secret tunnel") that veers west under city hall. The entrance to the stub is a hatch in the aldermen's parkade. There's a red sign near it that says "special procedures apply". Under the parkade, there's a concrete half-completed station with room for 4 tracks (1 island platform, 2 side platforms). The plan is to eventually have a tunnel under 8th Ave downtown.