The Valley of Death in Kamchatka
A narrow hollow at the foot of Kikhpinych in the Kronotsky reserve, discovered in 1975: dead animals and birds are found on its floor regularly, and people who linger there become dizzy and weak. The answer was found almost at once and turned out to be chemical — hydrogen sulphide and other gases seep from fissures and pool in the hollow in still weather. The valley is still lethal and closed to visitors, and the name stuck long before the explanation did.
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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