Aistabide'ko Aitzulo

Narrow entrance with a 20 m pit that ends in a cone of organic matter deposit. The chamber it connects to measures 15x20 m. In it the dip of the strata can be clearly seen. The continuation of the chamber is a low passage that connects with an active gallery 15 m long with a height of 1.5 m, which decreases as it approaches its end. If the aforementioned gallery is followed toward the upper part, it can be seen that it ascends and increases in size; its floor has a large quantity of blocks and rounded boulders with strong mechanical erosion. The end of the gallery is a small chaos ending in a crawlway that could be passable by digging out.

The end is an accumulation of silts and clay that obstruct the continuation. (Possible digging out).

In the Speleological Catalogue of I. Santesteban - C. Acaz., it was duplicated with Na 1399/114 Mozkordi II.