[1][2] In 1913, Lyubomir Miletich recorded the existence of a Bulgarian-populated chiflik of 15-20 houses named Dunnitsa (Дунница).

[5] The cave was formed as a result of the marble formation's erosion during the Toarcian age of the Early Jurassic epoch, dating back to around 180 Ma.

[3] The "Kuru" is extremely rich in terms of stalactites, stalagmites, stalagnates and wall dripstones, reaching massive proportions.

It is the source of the spring water flowing into Rezve Creek, the frontier between Turkey and Bulgaria.

The main entrance enters "Sulu" Cave, which is followed by a paved gallery complete with handrails.

Return to the entry point is by a marked trail through the woods, which takes around 15 minutes to reach.