"Ahmed" was an engineering student at Mosul University when so-called Islamic State (IS) militants overran the northern Iraqi city in June 2014.

The university shut and life became a daily struggle to survive.

This summer, Ahmed managed to escape. In the week before he left, at great personal risk he secretly kept an audio diary for the BBC.

Video produced by Joe Inwood and Nafiseh Kohnavard. Animation by Morteza Rakhtaala

Mosul: Smuggled diary reveals life of fear under IS