Hi, I done several dives on the Saskatchewan and Cape Breton, depending upon tides it's about 80ft to the top of the decks. Looking through my dive logs my depths ranged between 98 to 135'. We dropped to the bottom of the engine room on the Cape Breton which was at 135'. It hit the ground so hard that about 10' of the bottom is in the mud. I've used air and Nitrox blends up to 30%. Somewhere I have a map showing the decks of the Saskatchewan, if I can remember where I put it I can scan it and forward to you. There are several dive operator's in Nanaimo, I've used Ocean Explorers, but have heard good things about technically speaking. ( I like the boat TS uses over OE )
Hope that helps, let me know if theres anything I can help you with. The dives are awesome, theres quite a bit of growth on the Saskatchewan, the Cape Breton hasn't been down very long so not much growing on it.
Ron