Quote:
Originally Posted by mcminsen
It doesn't appear to be solid ground underneath Cordova Street. Those holes lead to secret tunnels and caves where monsters lurk.
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That's partially true! There are several old tunnels under downtown.
The most well-known is former CPR tunnel, now used by SkyTrain. Here's the original tunnel portal at ground level at Cordova & Waterfront:

1930 – 1933, CPR Dunsmuir Tunnel Western outlet at Cordova/Waterfront
Archives Item#: CVA 152-6.11.1
Source
The tunnel ended beside the Seaforth Armoury.

1930 – 1933, CPR Dunsmuir Tunnel eastern outlet at False Creek (where the viaduct runs overhead today)
Archives Item#: CVA 152-6.12
Source
There was also a mail tunnel between the Canada Post building and the CPR Railway Station (Waterfront Station).

Photo: Photo courtesy VPL 40568 / Photographer Studio: Province Newspaper
Source
There was also a tunnel between Sinclair Centre and what's now Waterfront Centre. Sinclair Centre once housed customs facilities and the tunnel was used to securely transport high-value goods in bond between to and from the pier that's now Canada Place. I can't find any pictures, unfortunately.
That's all of them as far as I know. There have been rumours for years that there are tunnels under Chinatown, but to the best of my knowledge those are actually connected basements and passages beneath alleys, such as the one found in Army and Navy, and not true tunnels.