Challenge in Gaza with Hamas's underground tunnels is unique - expert
Tunnel network includes 1,300 tunnels, spanning approximately 500 kilometers in total, with some of the tunnels located up to 70 meters underground.
(TOP) A fighter from the Izz el-Deen al-Qassam Brigades, Hamas’ armed wing, is seen inside an underground tunnel, in Gaza, August 18, 2014. (photo credit: MOHAMMED SALEM/REUTERS)Updated: 
