Arctic methane emissions permafrost thawing. Near the bottom of the first sinkhole, air contained unusually high concentrations of methane, according to tests conducted by the researchers. This hypothesis points to the destabilization of gas hydrates containing huge amounts of methane gas. According to researchers at Norway's Centre for Arctic Gas Hydrate (CAGE), through a process called geothermal heat flux, the Siberian permafrost which extends to the seabed of the Kara Sea, a section of the Arctic Ocean between the Yamal Peninsula and Novaya Zemlya, is thawing. According to a CAGE researcher, Aleksei Portnov, Methane hydrate is leaking in an area of at least
Novaya Zemlya Russians knew of Novaya Zemlya from the 11th century, when hunters from Novgorod visited the area. For western Europeans, the search for the Northern Sea Route in the 16th century led to its exploration. The first visit from a west European was by Hugh Willoughby in 1553. Dutch explorer Willem Barentsz reached the west coast of Novaya Zemlya in 1594, and in a subsequent expedition of 1596 rounded the Northern point and wintered on the Northeast coast. (Barentsz died during the expedition, and may have been buried on the Northern island.) During a later voyage by Fyodor Litke in 1821–1824,