It may look like blue pancakes, trapped under a sheet of ice, but it's not. Those are methane bubbles and part of what draws photographers and nature overs alike to visit a man-made lake in Alberta.
The Huffington Post, Alberta says that "It may be man-made but it flaunts the same myrtle green in the water and the same mountain peaks around the lake that other natural, liquid wonders that dot the Canadian Rockies landscape provide. [...] In the bluish tinge of the winter's ice, photographs capture puffy pedestals of gas, cotton-like bubbles frozen in time and milky stains that colour the frozen surface. [...] The features and colour showcased in all their glories in the ice are truly a sight to behold, but they are also to be respected, as they are nothing less than explosive. What lurks beneath the surface of this bewitching lake is methane gas. Methane is an effective fuel, burning - and exploding - with ease."
Want to know more? Check out the Smithsonian's article.