Syria: BBC's Ian Pannell meets children living underground
25 February 2013 Last updated at 17:58 GMT
As the conflict in Syria continues, the UN says nearly 70,000 people have died and hundreds of thousands have been forced from their homes.
Many have fled across the country's borders to safety, but those who stay are often trapped in appalling conditions - and some have taken to living underground to escape the worst of the fighting.
Ian Pannell reports from Northern Syria.