Ice can burn

I was watching National Geography's Earth: The Biography - Atmosphere on TV.

At one point the host goes to a lake frozen for hundreds of years in Siberian. Being a permafrost, the ice in the lake traps millions of air bubbles, most of which contain methane. If permafrost melts as global temperature rises, the world will get even warmer because methane is a green house gas 34 times stronger than CO2.

Here the host demonstrates how much methane permafrost contains: he digs a small hole into the ice and lights a match above the hole. Wow.. a blaze comes out of the ice! Then he digs the hole again and a flame blows right at him!!