Exclusive first look

By Clark Collis
Updated July 30, 2015 at 03:57 PM EDT

On Aug. 7, cinemagoers will see Jamie Bell as Ben Grimm (a.k.a The Thing) in Fantastic Four. But the British actor is currently filming a decidedly more reality-based movie — hostage thriller 6 Days.

Directed by Toa Fraser (The Dead Lands), the film concerns the 1980 Iranian Embassy siege in which armed gunmen stormed the Iranian Embassy in London and took 26 people hostage. Bell plays Rusty Firmin, a member of the elite unit of the British army called the SAS that became famous for its involvement in the incident.

6 Days costars Mark Strong (The Imitiation Game) and Abbie Cornish (Stop-Loss) and will likely be released next year.

You can exclusively see the first stills released from the film, above and below.