They reached a depth of approximately 235 meters in № 9-11 BS system has reached with a single ranks first in depth in the area. The expedition was held between 22.08-06.09.2009 in the period lasting 16 days, in the territory of cirque Suhodol in Northern Pirin. Main organizers of the event are Sofia Clubs “Helictit” and “Academic”. The Expedition camp was built on 2300 meters above sea level, for this purpose they used an abandoned ski camp.