A podcast from the CBC Radio Quirks & Quarks show, featuring Scott Dallimore, from Natural Resources Canada.
Up, under the surface of the Beaufort sea are some very strange geological formations, called pingo-like features, named after similar structures found on land. These pingo-like features are mounds rising up from the seabed, and no one's really sure how they came to be there. Scott Dallimore believes they're caused when methane gas and water try and rise up through the surface of the seabed. The methane and water are being released from methane hydrates that froze more than 10,000 years ago, when the land that's now below the Beaufort sea was actually above the surface, and covered in permafrost. This methane gas is slowly leaking from the pingo-like features, and could be slowly contributing to the greenhouse gases in the atmosphere.