26 October 1990,
60 climbers started a 36 night and day camp on the wall of the Atxarte quarry hanging on a platform. They made 24-hour shifts to report that the quarry was destroying the historic wall of Labargorri. They also criticized that the quarry damaged the natural park of Urkiola. In the fall of the following year they returned and the Ertzaintza arrested several people.
Source:
Sabino Ormazabal, Bidea Objective Group, 500 non-violent actions, another way to tell the story (Manu Robles Arangiz Foundation).