As far as I know this tunnel is also a memorial .... I'd be glad to hear more about it ! This tunnel, 1,000 metres long, had been used as barracks, first aid post and ammunitions depot since the first day of the battle . The Eastern- and Western entrance had been sealed with barbed wire and several metres of piled up sandbags. The tunnel was overcrowded with French soldiers who were cut off from their units or who were searching for shelter from the shellfire or who were on their way to or just returning from the front. On Monday 4 September 1916 a huge explosion took place in the tunnel; an explosion that could be compared to the one of fort Douaumont. In this particular case the cargo of a mule had caught fire, probably because of the cooking of the soldiers. The fire increased immensely, caused by the air current in the tunnel and turned into an inferno. Everybody panicked and over 500 soldiers were killed. Nevertheless, the confusion caused by this explosion remained unnoticed by the Germans. http://www.wereldoorlog1418.nl/battleverdun/battleverdun55/tavannesexplosie55.htm http://books.google.com/books?id=13...kp37Cw&sa=X&oi=book_result&resnum=6&ct=result http://upload.panoramio.com/photo/8225642