Christopher Nolan is following up 2014’s Interstellar with Dunkirk, a thriller set during the 1940 Dunkirk evacuation of British forces from Northern France that remains one of the brightest and darkest moments in British military history.

The operation marked the moment the Third Reich successfully conquered France, putting it in position to begin the eight-month-long aerial Blitz campaign against England three months later. But it also saw the successful escape from northern France of more than 300,000 British and allied soldiers who had been cut off and surrounded by German forces. Warner Bros has just released the first minimalist, but surprisingly tense trailer – after it was leaked online earlier this week – and you can watch it above now.

No word on the film’s plot just yet, but judging from the trailer it’s looking like a grunt’s eye view of what remains one of British history’s defining moments. As seen in the trailer above, the screaming of the Stuka “Jericho Trumpet” sirens as experienced by the soldiers huddling in boats makes the German air forces feel more like Cthulhu than conventional military enemies. A nice touch, especially considering the subject matter.

Written and directed by Nolan, Dunkirk is set to hit theaters July 21, 2017. Fionn Whitehead, Tom Hardy, Kenneth Branagh, Mark Rylance, Jack Lowden, Aneurin Barnard, Harry Styles, Cillian Murphy, James D’Arcy, Barry Keoghan, and Tom Glynn-Carney star.