Couple of papers from the Italian team that did bathymetry / seismics in Lake Cheko: http://sci-hub.cc/10.1007/s12210-015-0403-8 http://sci-hub.cc/10.1007/s122

Couple of papers from the Italian team that did bathymetry / seismics in Lake Cheko: http://sci-hub.cc/10.1007/s12210-015-0403-8 http://sci-hub.cc/10.1007/s12210-015-0403-8 https://www.researchgate.net/publication/229759371_Lake_Cheko_and_the_Tunguska_Event_Impact_or_non-impact https://www.researchgate.net/publication/229759371_Lake_Chek... Some argument against Cheko being an impact crater, referenced in the above work: http://www.univie.ac.at/geochemistry/koeberl/publikation_list/312-Lake-Cheko-not-impact-crater-Terra-Nova-2008.pdf http://www.univie.ac.at/geochemistry/koeberl/publikation_lis... Data from the Italian team that investigated Cheko: http://www-th.bo.infn.it/tunguska/ http://www-th.bo.infn.it/tunguska/