The Karst and Istrian territory is characterized by rock chasms in the shape of an inverted funnel formed by water erosion, called "sinkholes". During the Second World War these sinkholes were used to eliminate bodies fallen during the clashes between Nazi-fascists and partisans. Those found were mainly corpses of victims of executions decided by summary trials. The condemned were lined up on the edge of the abyss, tied together and shot. The affected bodies tumbled inside the sinkhole dragging the entire group with them, often still alive. In this project we focused on the research carried out in the 90s by Giuseppe Cavini concerning the sinkhole called "Bus de la Lum", Bosco del Cansiglio, Italy. On his need to investigate a historical truth despite the time that has passed. A historical truth which is often elusive, denied, painful and personal but which never ceases to be present.