One look at the frozen Lake Abraham, in Alberta, Canada, and you know something special is going on below the ice. At first glance it looks a bit like pillars of ice have formed below the water, but the natural phenomenon is actually caused by bubbles of frozen Methane – and they’re surprisingly dangerous. These frozen bubbles are actually methane gas that is produced when bacteria at the bottom of the lake decomposes organic matter.
Amazing video of exploding under-ice methane gas in Siberia
The resulting methane is the waste (of sorts) of this bacterium, and it’s highly flammable, so probably best not to light up if you’re skating over the lake.