Z-150

It is a vertical cavity with two entrances that lead into the same system. It has a 10 m shaft and a constriction at the bottom that gives access to a series of shafts in succession of 8, 9, 16, 34, a new 27 shaft and another parallel 19 shaft, with a narrow ramp bottom at 100 m; it connects with another of 26, 14, 8, 13, 20, 6, 6, 7 in a staircase and, at the same time, with others of 57, 22, 13, 14, 38 to end in a 4 m drop, and a narrow passage at 354 m.