Another access point lies on the east at the San Adrian tunnel and the Medieval road crossing it. At the southern exit of the tunnel, after a 50-metre walk, from a clearing a trail penetrates almost unnoticed up the forest on the right, so beginning a 30-odd minute uphill struggle (not in vain is it dubbed Kalbario Bidea, 'Calvary Trail') with loose pebbles all along. At this point, an opening affords a beautiful view onto the north and the trail cuts along the verge of several limestone cliffs on its way north-west. In another 30 minutes, the Aizkorri summit may be attained. A stark refuge hut (built 1934 as a shelter for shepherds and hikers) and the Santo Cristo hermitage lie by the summit.