East Siberian Arctic Shelf Expedition 2011.
In an interview published February 9, 2012, expedition leader Dr. Igor Semiletov said: "the methane release that we have identified in the Arctic is both unprecedented in terms of its volume and has the potential to increase greatly if warming trends continue."
Video uploaded by the International Arctic Research Center (IARC) at the University of Alaska Fairbanks (UAF) at Youtube:
http://www.youtube.com/watch?v=b73wLHoiQyI
Also view map of the study area explored during the expedition.