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The U.S. Geological Survey estimates that about 85 trillion cubic feet (TCF) of natural gas could be extracted from North Slope gas hydrates: Assessment of Gas Hydrate Resources on the North Slope, Alaska, 2008. The USGS gas hydrates web page is here: Gas Hydrates.
The USGS describes gas hydrates as,
In 1970 the U.S nuclear submarine Queenfish explored the fringes of the Soviet Union's eastern Arctic Laptev, East Siberian, and Chukchi Seas. Alfred McLaren, the Captain of the Queenfish at the time, told the story last spring in his book Unknown Waters.
Queenfish followed the route shown in the map below (taken from a New York Times story based on the book): Queenfish: A Cold War Tale.
The route of the Queenfish through the Arctic Ocean. Source: New York Times.
The Queenfish entered the Chukchi Sea on July 30, passing submerged through the Bering Strait. She turned east, traveled to the latitude of Barrow, and then took off for the pole, reaching it on on August 5.