Up to 2005, the oceans over the shallow continental shelves in the Russian Arctic (ESAS, Laptev) were ice covered, keeping the -100 meter deep oceans near freezing temperatures.
Since 2005, the ice cap cover has gone. The water has warmed as high as 17 degrees C there in summer, heating the sea-floor, perforating the permafrost cap, & thawing methane hydrates. Ebulition (bubbling methane) is rising up the water into the atmosphere in ever increasing amounts.
Please support my videos and website with a donation at http://paulbeckwith.net