>> navai: eventually, commander kadoom and his badr fighters reach their destination. (gun firing in distance) >> navai: what was that shooting? >> here, it's good, but maybe go to there, it's not safe. >> navai: kadoom and his men are securing tal abtah's hospital. they've been given the names of sunnis who might be isis collaborators. >> this picture for cutting the hand off someone. >> navai: they're now taking me to an isis tunnel, and isis have built all this network of tunnels in this area. and this is how they operated, and this is how they fought these guys. they'd pop out of these tunnels. god, it's big-- it's a sophisticated tunnel. towards the end of my trip, i meet fighters from another group. the sayed shuhada brigades are powerful, with a representative in parliament. they're a breakaway group from the hezbollah brigades, and, like several other militias, their main patron is iran. their leader is abu alaa al waeli. could you have fought this war against isis without iran's help? >> navai: and what support has your group received directly from iran? >> na