In 1997 an underwater borehole was drilled in the South part of Lake Baikal (water depth, 1,433 m; borehole depth, 225 m; the temperature at these depths is about 10°C). Samples of sediments containing methane hydrate were collected at depths 121 and 161 m below bottom. At present, this is the only example of the existence of gas hydrates in a fresh‐water basin under non‐permafrost conditions.
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