# Is Lake Cheko a crater made by a fragment in 1908? · 1908 Tunguska event > Three answers have been proposed. The lake is an older thermokarst or river-plain lake unrelated to the event. leads, with evidence 1 for: partly… Source: https://mysteriesdept.com/mysteries/tunguska-event/questions/QST0D4ECBG47348/is-lake-cheko-a-crater-made-by-a-fragment-in-1908 Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-26T11:58:57+00:00 --- **0** # Is Lake Cheko a crater made by a fragment in 1908? Asked 26 Oct 2026 by [**apollo** ](https://mysteriesdept.com/u/apollo)·Part of [Why have no fragments of the body been found?](https://mysteriesdept.com/mysteries/tunguska-event/questions/QST0D4ECB8A5SWD/why-have-no-fragments-of-the-body-been-found)·3 answers·0·0 following **Most likely: the lake is an older thermokarst or river-plain lake unrelated to the event** Ahead on the evidence, not yet confirmed. It needs two reviews to be accepted. ## Where it stands Three answers have been proposed. The lake is an older thermokarst or river-plain lake unrelated to the event. leads, with evidence 1 for: partly supported by its tests. Two are still possible. ## Why it matters If it is, a fragment survived and lies at the bottom of the lake; the question has been argued since 2007 with geophysics, sediment dating and tree rings⁠[[1]](https://mysteriesdept.com/sources/SRC0D4EC00Y36BN/a-possible-impact-crater-for-the-1908-tunguska-event)⁠[[2]](https://mysteriesdept.com/sources/SRC0D4EC08R7ZWP/evidence-that-lake-cheko-is-not-an-impact-crater)⁠[[3]](https://mysteriesdept.com/sources/SRC0D4EC1063S5M/sedimentation-rate-in-cheko-lake-evenkia-siberia-new). ## Answers 3 [**The lake is an older thermokarst or river-plain lake unrelated to the event.** ](https://mysteriesdept.com/mysteries/tunguska-event/answers/ANS0D4ECNGE3RMQ/the-lake-is-an-older-thermokarst-or-river-plain-lake) Partly supported by its tests Evidence: 1 for Most likely [**None of these.** ](https://mysteriesdept.com/mysteries/tunguska-event/answers/ANS0D4ECP027XZJ/none-of-these) Not tested enough to call either way Evidence: none yet Still possible [**The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body.** ](https://mysteriesdept.com/mysteries/tunguska-event/answers/ANS0D4ECKSR09V9/the-lake-fills-a-small-crater-excavated-in-soft-permafrost) Failed a test; not refuted outright Evidence: 3 for, 3 against Disputed ## History 1. 2007[Gasperini et al. puts forward: the lake fills a small crater excavated in soft, permafrost ground by a fragment of the body.](https://mysteriesdept.com/sources/SRC0D4EC00Y36BN/a-possible-impact-crater-for-the-1908-tunguska-event) 1. 2007[Gasperini et al.: acoustic imaging shows a funnel-shaped floor and deposits the authors read as crater fill.](https://mysteriesdept.com/sources/SRC0D4EC00Y36BN/a-possible-impact-crater-for-the-1908-tunguska-event)For: The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body. 1. 2008[Collins et al. puts forward: the lake is an older thermokarst or river-plain lake unrelated to the event.](https://mysteriesdept.com/sources/SRC0D4EC08R7ZWP/evidence-that-lake-cheko-is-not-an-impact-crater) 1. 2008[Collins et al.: the lake lacks crater morphology and impactor material and has mature trees close by.](https://mysteriesdept.com/sources/SRC0D4EC08R7ZWP/evidence-that-lake-cheko-is-not-an-impact-crater)Against: The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body. 1. 2014[Fantucci et al.: trees near the lake that germinated after 1908 grew differently from forest trees, consistent with a new lake.](https://mysteriesdept.com/sources/SRC0D4EC0RC5XK5/the-tunguska-event-and-cheko-lake-origin-dendrochronological)For: The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body. 1. 2017[Rogozin et al.: 137Cs, 210Pb and varves show the lake is much older than 1908.](https://mysteriesdept.com/sources/SRC0D4EC1063S5M/sedimentation-rate-in-cheko-lake-evenkia-siberia-new)Against: The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body. 1. 2017[Rogozin et al.: sediment dating shows the lake predates 1908.](https://mysteriesdept.com/sources/SRC0D4EC1063S5M/sedimentation-rate-in-cheko-lake-evenkia-siberia-new)For: The lake is an older thermokarst or river-plain lake unrelated to the event. 1. 2018[Foschini et al.: a rubble-pile body could have shed a boulder that made the lake.](https://mysteriesdept.com/sources/SRC0D4EC1806JBB/the-atmospheric-fragmentation-of-the-1908-tunguska-cosmic)For: The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body. 1. 2024[Carbognani et al.: the lake lies about 3.5 km outside the 3-sigma strewn field for the most likely trajectory.](https://mysteriesdept.com/sources/SRC0D4EBX367RST/computation-of-a-possible-tunguskas-strewn-field)Against: The lake fills a small crater excavated in soft, permafrost ground by a fragment of the body. 1. 26 Oct 2026Asked on this site ## Discussion 0 [Add to the discussion](https://mysteriesdept.com/signin?next=/mysteries/tunguska-event/questions/QST0D4ECBG47348/is-lake-cheko-a-crater-made-by-a-fragment-in-1908%23discussion) Help with this question [ **Propose an answer** Something the evidence could support or rule out ] [ **Propose an answer** Something the evidence could support or rule out ](https://mysteriesdept.com/signin?next=/mysteries/tunguska-event/questions/QST0D4ECBG47348/is-lake-cheko-a-crater-made-by-a-fragment-in-1908%23add-answer) [ **Add evidence** A result for or against an answer ] [ **Add evidence** A result for or against an answer ](https://mysteriesdept.com/signin?next=/mysteries/tunguska-event/questions/QST0D4ECBG47348/is-lake-cheko-a-crater-made-by-a-fragment-in-1908%23add-evidence) [ **Ask a sub-question** A smaller question that would help settle this one ] [ **Ask a sub-question** A smaller question that would help settle this one ](https://mysteriesdept.com/signin?next=/mysteries/tunguska-event/questions/QST0D4ECBG47348/is-lake-cheko-a-crater-made-by-a-fragment-in-1908%23add-question) [ **Add a source** A paper, archive record or image ] [ **Add a source** A paper, archive record or image ](https://mysteriesdept.com/signin?next=/mysteries/tunguska-event/questions/QST0D4ECBG47348/is-lake-cheko-a-crater-made-by-a-fragment-in-1908%23add-source) Where it fits 1908 Tunguska event [**Why have no fragments of the body been found?** ](https://mysteriesdept.com/mysteries/tunguska-event/questions/QST0D4ECB8A5SWD/why-have-no-fragments-of-the-body-been-found)Key question · most likely the body disintegrated into vapour and microscopic particles; nothing larger survived **Is Lake Cheko a crater made by a fragment in 1908?** You're here · the lake is an older thermokarst or river-plain lake unrelated to the event [ Ask a question under this one ]