Excellent idea, BlackDog. I am familiar with 'cold ones' and I even know a place (or two) where these 'cold ones' may be had.
My latest information has opened up a new level of secrets, or at least has explained one or two things.
Street levels have changed over the years, with Johnston Street having been raised at least a full story, which is to say that the original street level is about one story below where it is now. So whatever storefronts, windows, doors, etc were there, these are all under ground.
Also, there's a place a few block up from the water, near Quadra/Vancouver Street(s) where there appears to be something of a sinkhole. Johnston Street was, at one time long ago, a ravine, and has since been filled in. I guess the city engineers back then neglected to include the possibility that the fill would settle, so now the street is sinking. It is alleged that this sinkhole, or rather the ravine, has some form of wall/ceiling structure, which would make it (for all intents and purposes) a tunnel.
I have learned also that the entrances I outlined in my first post (see above) around Market Square that extend under Pandora and Johnstone Streets respectively, are coal shoots that begin at water's edge and extend up the streets to the original Market Square buildings. These entrances are storage bins for coal and other goods that arrived in the city by ship about 100 years ago. Apparently, there are still rail cars...flatbeds...that were used to haul coal etc. up from the shoreline to the bins.
Now, none of this addresses another story I heard recently. There is a major network of tunnels that connects the Ross Bay Cemetary to the city center. This is likely false (who cares?) and is most likely related to a story published in a book titled Michelle Remembers, in which a woman claims to have been abducted as a child and forced into participating in satanic rituals. A few old crypts in this cemetary certainly do look like those old Batman cave type entrances (turn a lever and a door opens/floor opens to reveal a staircase that connects to tunnels, ritual chambers, etc.). One person I spoke with swears that she's seen people disappear into one of these crypts.
Whatever the case, the stories are numerous and are likely to prove more interesting than any 'fact' related to them.