(Written by Péter Sűrű)
We have already known that Sebes-spring has two sinkhole: Sinkhole Szivárvány was already connected with Cave Sebes, but the another one, Sinkhole Fenyves is not yet.
Analizing the waveforms in Cave Fenyves we got the following conclusions: the passage from this cave runs to Sebes Spring but meets with the passages from Szivárvány before it’s reach the spring.
We suppose founding this another passage on 22nd January. New parts collaterate to different levels and their estimated length is 500 meters. It means the total length of Szivárvány-Sebes Cave System got up to 3,5 kilometer.