Weaver Cave

It runs from the west (downstream) side of the Rak Škocjan Valley, where it has two entrances, and continues into Planina Cave.

It is traversed by Rak Creek, part of the Ljubljanica source system.

[2] Due to sumps, the stream of the Rak is very difficult to follow and was explored by divers only in 1974, when the majority of the cave was discovered in the course of a rescue expedition,[2] and in August 2012.

[5] The first description of Weaver Cave was published in 1687 by Johann Weikhard von Valvasor in the Philosophical Transactions of the Royal Society.

His painting of the Great Natural Bridge of Rak Škocjan as seen from the inside of the cave is on display in the National Gallery of Slovenia.

The Rak going underground in Weaver Cave. The first part of the video was recorded from the upper entrance of the cave, and the second part near the ponor.
Depiction of Rak Škocjan as seen from Weaver's Cave. Franz Kurz zum Thurn und Goldenstein, 1850s.