The passages under the Predjama Castle in slovenia could be longer than thought.
Researchers have discovered several new passageways. The cave is already one of the longest in the country, but could be longer. Nearly 2 kilometers of new passageways have now been found.
Multiple smaller tunnels have yet to be fully explored.
Predjama Cave is among the top five longest caves in Slovenia. It is also the second longest show cave behind the Postojna Cave.
![Foto: BoBo Foto: BoBo](https://img.rtvcdn.si/_up/upload/2018/03/17/65483265.jpg)
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