The west portal of the new downtown transit tunnel is on LeBreton Flats, immediately west of Bronson.
For two years, looking down from Commissioner Street into the excavation revealed only a steep slope going down underground. It was a road, traversed mostly by trucks to get into the tunnel. The sides of the road cut were steel posts and wooden retaining beams, visible in the picture below.
Now, that steep truck slope has been ground down to a gentler slope required for the tracks, and the few hundred feet that was open air cut is being covered up as tunnel sections are built. Here is a view into the cut, with the tunnel roof advancing toward us. The already-underground bored-out tunnel portion is below the feet of the cameraperson standing on Commissioner Street; the final tunnel portal is off in the distance slightly around the bend towards Pimisi Station.
Here’s the opposite view, from the Booth Street Freeway bridge at Pimisi Station, looking back towards the downtown:
The real, final tunnel portal is shown towards the right side; the previously discussed electrical transformer station is the gray building towards the left, and the aqueduct and Claridgeland further to the left.
The white building is a temporary construction shed, and will be replaced someday with the Jim Watson Public Library.