Thanks for the comments, guys. Dale, we were not diving the cove. We were east of the cove. The entry was behind the big commemorative anchor to admiral Caulfield. There are a couple of rock slopes that go into the water. Depending on tides and the sloping rock you chose, you may have to jump to get into the water.
Then you swim out about 100 m towards the centre of the Burrard inlet in the general direction to ubc. You'll find a chain of 20 ft high rock formations. Bottom is at around 45 to 50 ft. The octopi live in these rocks.
If you dive during the day, you'll likely find a lot of fast pwc and boat traffic zipping right above you. Take an smb and make sure you pop it out if you need to surface at that location. Current can be another hazard, so take a $20 bill in case you need to catch a taxi.
Finally, be careful with the headings your compass displays. There seems to be a sort of ferrous deposit somewhere that will affect compass readings. So be mindful of terrain features and depths because they'll help you get back to your exit point.