Watch Inside ISIS Terror Tunnels as Iraqi Army Stunned to Find Secret Underground Military Base The extensive network was unveiled after the terrorists fled the outskirts of Fallujah. The militants use them to reach the front line to fight and then slink away to safety. A warren of terror tunnels excavated by ISIS terror thugs has been discovered by Iraqi forces. The extensive network was unveiled after the terrorists fled the outskirts of Fallujah. One of the longest tunnels surrounded a brick factory, Hashid Shaabi fighters said. ISIS used the tunnels to approach, appear and escape from the front-line to reduce their casualties. The tunnels run under streets and between houses, where the terror thugs take cover to fight their advancing enemy. Iraqi troops have pushed towards Fallujah from the south, aiming to completely surround the ISIS-held city, Iraq's elite counter-terrorism forces said. "Our troops are now in the process of surrounding the city from all (sides),"
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