Non-invasive research of tunneling heritage in the Ypres Salient (1914-1918)Â -Â research of the Tor Top tunnel system

During the First World War, the stalemate in the trenches resulted in the creation of a vast network of field defences in different theatres of war. The rediscovery of ancient siege techniques, such as military mining and the ever-increasing power of artillery fire, resulted in the creation of an underground world of tunnels and mine galleries deep below the surface. This paper explores the potential of integrating war records and non-invasive techniques (historical aerial photographs, geophysical soil-sensing techniques and airborne laser scanning) for the study of this buried war heritage in Belgium.