The Patomskiy Crater
A cone of shattered limestone forty metres high in the remote taiga of Irkutsk Oblast, found by the geologist Vadim Kolpakov in 1949. The Evenks called it the Fire Eagle's Nest and kept away. Every explanation has been tried: meteorite, volcanic gas, an underground nuclear blast, a uranium deposit. None is confirmed, and the leader of the 2005 expedition died of a heart attack on the way to it, which did the reputation no harm.
The Bloop
In 1997 hydrophones belonging to the US National Oceanic and Atmospheric Administration recorded an ultra-low-frequency sound in the South Pacific loud enough to be picked up by sensors three thousand miles apart. Its profile resembled a biological one, and for two decades the Bloop was the leading exhibit for anyone who believes in undiscovered giants in the ocean. NOAA settled it in 2012: an icequake, an iceberg fracturing off Antarctica. The sound stopped being a mystery but remains one of the best-known audio files in internet history.
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