I'm an advanced open water diver with SSI, and I assist instructors with open water certification of new divers.  This weekend I got a shiny new underwater camera for Fathers day - and decided to test it out in Jasper.

There's not a whole lot of life in the mountain lakes, though there's plenty of interesting geology.  Lac Beauvert is a cool lake because it's filled from the bottom by glacial vents.  Ice cold water direct from the glaciers bubble up from the lake bed and form little mini-volcano-like structures.

If you've never seen one, this is what they look like:

http://www.youtube.com/watch?v=qTCHt9IAsaw&feature=g-upl

There's literally hundreds of these spread around the bottom of the lake.  It's very cool.