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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Socotra

Una isla yemení del océano Índico, aislada del continente desde hace millones de años. Un tercio de sus plantas no crece en ningún otro sitio, incluidos los drago de copa en paraguas que le dan ese aire extraterrestre.