July 9, 2011 Frozen air bubbles

[blueboy56]

Another possible explanation is that they are the gaseous diffusions from the GI tract of hibernating furred arctic mannatees. As they slowly digest stored fat, it eventually works its way out and floats to the surface. Some Inuit tribes use it as fuel by drilling a small hole in the top of the ice and lighting it. As the gas burns, it goes down and opens up the underlying bubbles. Really.