I remember driving northwest from Vancouver and taking a ferry to a small island. I had wanted to dive a fairly deep shipwreck that I had seen on some TV show, but the arrangements fell through when I got there and the dive shop hooked me up with a local diver who took me on a couple of "beach" dives. It was still pretty memorable diving. Very cold (45F) and fairly dark, like a cavern dive. I think it's the same place. I'll check the map in a minute.
OK I see it's at Sechelt INLET. Here's a blurb about the wreck:
One of the very best wreck dives found anywhere is located in Sechelt Inlet The Wreck of HMCS Chaudiere, a huge warship is recommended for expert divers with wreck penetration and for intermediate divers for exterior wreck dives. This is a challenge as the ship is deep with 67 rooms on four decks that are all open for diving. Many rooms still hold equipment that adds to the dive. There is also plenty of marine life in and around this wreck. The HMCS Chaudiere Wreck sits in the Sechelt Inlet, in the bay north of Kuneching Point. Launch or charter from Tillicum Bay or Porpoise Bay and watch for the yellow buoys that mark the wreck.
(edited to add useless info on a wreck dive that I didn't get to do)