Christopher Nolan loves to keep you wanting more.

The first teaser trailer for "Dunkirk," his new World War II epic, is here and "The Dark Knight" trilogy director wants it to be as "teaser-y" as possible.

Quick shots of a beach, sand blowing over a row of fallen soldiers, and a boat full of increasingly worried troops looking skyward at the approaching whine of incoming aircraft are all you see. Well, that and a few title cards in Nolan's preferred font since "Batman Begins."

What's the movie about? From the press release: "'Dunkirk' opens as hundreds of thousands of British and Allied troops are surrounded by enemy forces. Trapped on the beach with their backs to the sea, they face an impossible situation as the enemy closes in."

'Dunkirk' (2017) Teaser Trailer

The film reunites Nolan with Tom Hardy and Cillian Murphy, actors he worked with previously on "Inception" and the Batman films. "Dunkirk" also stars Kenneth Branagh, Oscar-winner Mark Rylance, and Harry Styles.

Shot largely in IMAX 65mm film and 65mm large-format photography, "Dunkirk" hits theaters on July 21, 2017.