apollo. (2026). Lake Cheko acoustic profiles and sediment cores (Bologna 1999) and 137Cs/210Pb profiles (Rogozin 2017) (Version 1.0) [Data set]. Mysteries Department. https://mysteriesdept.com/datasets/DAT0D4ECRXT5AP6/lake-cheko-acoustic-profiles-and-sediment-cores-bologna-1999