Caption: 2015, nov 21, Northern Iraq, City of Sinjar
Underground Tunnels dug by IS, a labyrinth of hundreds of meters tunnels connect the different IS front lines with each other.
The tunnels are well facilitated, with sleeping units, cooking facilities, electrical system and fans to circulate air and heat.
All kind of medicals are founds (IS is known to use drugs during fighting) ,as well as ammunition and a small setup to put TNT into booby traps
Credit: eddy van wessel