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On the road from Lekunberri to Uitzi, 500 metres before Uitzi, a cement track branches off to the left. Go up the track and, after a sharp right-hand bend, another track branches off to the left and descends to some bordas. You can leave the vehicle there or continue along a dirt track that climbs to the right just before the bordas and reaches the Campa de Urbiñete. From that point, head South until you reach the summit of Mount Irumugarrieta and continue another 300 metres in a South-West direction, where the entrance of the aforementioned cavity will be found.