Sorry, you guys are just kinda making things up. Y'are.
The difference in the depth that's being excavated for the Bay Concourse compared to what has already been excavated in negligible. Where the difference is substantial is in the size of the area being excavated.
What was excavated in the first phase was the Food Court area, the Market area, and the area (approximately) where units 400 and 401 are shown below.
What was not excavated was the York St. Promenade nor the Front St. Promenade area, as those aren't going any deeper than before, just being reconfigured.
That leaves only the Bay St. Promenade area to excavate in this phase, and that's about a third the size of what was done in phase one.
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Note that the word excavate is being used because that's what they've been doing - not demolishing existing other rumoured lower floors. There were a lot of walls to demolish in the old back-of-house area (what the old lower floor used to look like is below), but that was it for how low it went.
So, everything below was at the same approximate level, within a couple of feet. In the new basement level, everything other than the York and Front Street Promenade areas are now close to three metres deeper.
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