In Metro Vancouver:
Skytrain tunnels:
Dunsmuir Tunnel (Now Skytrain, former CPR)
http://www.miss604.com/2010/07/tunne...rs-choice.html
https://www.youtube.com/watch?v=RvAR...52FA9B&index=8
(After the Train comes out of the tunnel, the Skytrain guideway is on the old ground level, just a metre or so above sea level. East Cordova is above. You can see the lower floors of the Marine Building, which was built on the edge of a cliff. If you were there in the train you could see lower floors of some buildings, as well as parking. Cordova was built above in like 2002 or something. There are photos around on the internet what the area looked like before and after all of this. It's like a tiny version of Pioneer square in Seattle. You could drive into part of this going east on Cordova past Waterfront Station, but would be stopped)
Columbia station Tunnel
https://www.flickr.com/photos/sillygwailo/201426360/
https://www.flickr.com/photos/dennis...rd/5533579810/
New Westminster Tunnel (under Columbia)
Canada Line Tunnel
https://www.youtube.com/watch?v=DxgOMdvvEBc
Heavy Rail Tunnels:
Lonsdale Tunnel (Built to separate freight from street cars)
https://i.ytimg.com/vi/v2doHiaXJuo/maxresdefault.jpg
http://wikimapia.org/15193574/Lonsdale-Tunnel
Thornton Tunnel (From the south end of the Second Narrows train bridge diagonally under North Burnaby to the main line)
http://www.bing.com/maps/?v=2&cp=s69...=o&form=LMLTCC
http://www.bing.com/maps/?v=2&cp=s6f...=o&form=LMLTCC
Road Tunnels:
Cassiar Tunnel (Twin 3 lanes, decent length freeway tunnel)
http://vuosiamaailmalla.fi/blog/wp-c...ar_tunnel1.jpg
George Massey Tunnel (Twin 2 lanes, under the Fraser River, similar to the river tunnel shown in Montreal)
https://www.youtube.com/watch?v=RoDPHM_rCJc
Skeena Street Tunnel (rarely mentioned road tunnel under the freeway near the Ironworkers Memorial bridge)
Other:
Canada Post Tunnel (Canada Post built a tunnel from the basement of the Former HQ to what is now Waterfront station)
http://www.huffingtonpost.ca/2013/12...n_4446068.html
http://www.discovervancouver.com/art...r-underground/
UBC, Vancouver General Hospital, both have large steam tunnel networks. VGH, being a hospital campus spanning many buildings, has underground tunnels between them. There is also a hospital tunnel from the main Royal Columbian hospital buildings in New Westminster to the psych ward (former nurses residences).
http://ubyssey.ca/culture/notes-from-the-underground/
http://www.uer.ca/locations/show.asp?locid=24075
There is also a large section of downtown that is supplied steam heating so presumably there would be at least some human sized tunnels related to that. There are known to be large BC hydro (power utility) vaults, as mentioned during news stories large power outages.
Pacific Centre has part of it's mall underground, under streets, and there are vehicle ramps to go below the street level to park.
Last but not least there were many rumours about Chinatown tunnels, but all the current sources say there were really just connected basements here and there. That being said, Saskatoon and Portland did actually have Chinatown smuggling tunnels, so who knows.