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
Severnaya Zemlya Fjord, southeast of Cape Unslicht, off Bolshevik Island's northern end at . The island has an irregular shape and is long with a maximum width of . A deep round lake with a diameter of is located in the western part of the island and is connected to the sea by a small channel. Almost all the island is rocky, except for the northwestern part. The highest point of Lishniy Island is South of Lishniy lies "Yuzhnyy", a smaller island, and two islets. Lishniy off Severnaya Zemlya should not be confused with Lishny Island off Toll Bay, south of the