Krška jama – Krka spring sump
Krška jama opens just above the karst spring of the Krka river, where water from the Račna karst field resurfaces. After about 210 m of dry passage the cave ends in a 30 m long sump lake that continues into flooded tunnels; underwater exploration began in 1994, and on 14 October 1995 Samo Morel and Pavle Košir explored the siphon. The first sump has been passed to a dry chamber, and the explored length is about 490 m. Over 30 animal species live here, including olms.
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