The longest underwater gypsum cave in the world — over five kilometres of flooded galleries under the left bank at Kungur. The water is clear enough for fifty metres of visibility, and divers describe flying rather than diving. The cave has killed several experienced divers: the sumps offer no landmarks, and someone who loses the line does not find the way back. Locals kept clear of the sinkholes long before anyone arrived with tanks.

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Sokotra

Jemeńska wyspa na Oceanie Indyjskim, odcięta od kontynentu od milionów lat. Jedna trzecia jej roślin nie rośnie nigdzie indziej — w tym smokowce o parasolowatych koronach, przez które wygląda pozaziemsko.