laith: absolutely, i unearthed a few corpses myself. >> laith and his family, as well as seven otherey took in, only survived the seven month long siege and assault that flattened his neighbourhood thanks to the solid stones of this ancient cellar. they nearly starved, and they were all badly injured when rockets pounded the house, but unlike so many others here, they lived. laith returned home 3years ago, after an ngo helped him rebuild his house. he says little has changed here since then, and any work that has been done is by charities and locals, with no help from the authorities. laith: it's been four years since we were liberated, four years since isis left, and the government hasn't been here for us. we're all enraged by the government because it's criminal, shameful. >> reconstruction is just one of the many challenges isis' short but devastating occupation of mosul has left in its wake. while the group may have been pushed out, they left a deadly trail behind them. the u.n. estimates it could take up to a decade to clear all the explosives isis planted behind them as they le

laith returned home three years ag after an n.g.o. helped him rebuild his house. heays little has changed here since then, and any work that has been done is by charities and locals, with no help from the authorities. >> ( translated ): it's been four years since we were liberated. four years since isis left. and the government hasn't been here for us. we're all enraged by the government because it's criminal, shameful. >> reporter: reconstruction is just one of the many challenges isis' short but devastating occupation of mosul has left in its wake. while the group may have been pushed out, they left a deadly trail behind them. the u.n. estimates it could take up to a decade to clear all the explosives isis planted behind them as they left. wayne lomax is an international de-mining expert who's been training local teams to clear leftover explosives. what's the risk as time goes on? >> how long can a battery last? a lot of the i.e.d.s i pull out of the ground still have perfectly viable batteries. one thing we know about isis is they were very clever in their i.e.