That is an awe-inspiring perspective of the excavation. It looks like they have about another 15-20 feet to go below the Market Street level; however, I am just guessing based on these renderings -
http://www.halifax2016.ca/?utm_expid=685...cchalifax.com%2Fen%2Fhome%2Fdefault.aspx
I wonder if they will start the ground floors along Argyle Street (parking levels and exhibition hall) and then build west towards Market Street prior to completing the Market Street excavation? If so, they could use the concrete structure to support the Market Street retaining wall and then do the final excavation. Otherwise, if they do all the excavation prior to starting construction then they would have almost a 70 foot retaining wall along Market Street to support.
Any guesses on how the Market Street retaining wall will be supported? It seems like a monumental task.
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