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Lake Cheko (Russian: Чеко) is a small freshwater lake in Siberiamarker, near the Podkamennaya Tunguska River, in what is now the Evenkiysky District of the Krasnoyarsk Kraimarker. It is a small bowl shaped lake, 708 m long, 364 m wide and about 50 m deep.

Scientists have speculated that Lake Cheko was created during the Tunguska eventmarker, an explosion on 30 June 1908 that destroyed more than of Siberian taiga. It is suggested that the lake, which lies approximately 8 kilometres north-north-west of the event hypocentre, was formed by a fragment impacting the ground.

However a 1961 investigation estimated the age of the lake to be at least 5000 years, based on meters-thick silt deposits on the lake bed,although newer research suggests that only a meter or so of the sediment layer on the lake bed is "normal lacustrine sedimentation", indicating a much younger lake of about 100 years.

Acoustic-echo soundings of the lake floor provide further support for the hypothesis, revealing a conical shape for the lake bed, which is consistent with an impact crater. Also, the lake's long axis points to the epicenter of the Tunguska explosion, about 7.0 km away.Magnetic readings also indicate a possible meter-sized chunk of rock below the lake's deepest point, which may be a fragment of the colliding body. However, researchers at Imperial College Londonmarker, point out that many of the trees surrounding the lake are older than 100 years, which suggests that the lake could not have been created by an impact in 1908.

Researchers from the University of Bolognamarker intend to investigate the dense object, 10 meters below the lake bed, in 2009.

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