This article requires some background information.  Like how did the Islamic State get into the battle in Afghanistan when the U.S. had been fighting against the Taliban in Afghanistan all these many years? 
And how did the Islamic State manage to create that major tunnel system?  The U.S. already destroyed all the major tunnels where they claimed Osama bin Laden was hiding many years ago.  It takes a lot of construction effort to dig a major tunnel that needs a major bomb to destroy it.