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"Under us someone is",-this emotional exclamation belonged American ufologist Alan Polanski, with a small group of researchers, two years ago, went to an abandoned in the mountains of South American lake, from which, according to stories accidentally wandered there travellers, heard strange sounds. After almost a week of waiting researchers, who was in an inflatable boat, too, they heard and recorded using a hydrophone. "These sounds cannot belong to any creatures biological nature and are clearly man-made origin", - summarized in the report of the head of the expedition.