Visionary helmer Alfonso Cuarón has kept his fans waiting a whopping seven years for a follow-up to his dystopian downer "Children of Men," and by all accounts, he hasn't been resting on his laurels. His seventh feature "Gravity" has been a long time coming, but the 3D project is no doubt his most ambitious and ballsiest endeavor to date (over the weekend at Comic-Con he said "the whole film was a miscalculation," in that it took four-and-a-half years to bring to the screen.)

In the sci-fi film, Cuarón finds George Clooney and Sandra Bullock suiting up as two astronauts struggling to survive on a remote space station after satellite debris wipes out the rest of the crew and their ship. Featuring a cast of just two and a dark premise, the film is an anomaly for distributor Warner Bros., who's no doubt betting it has a game changer on its hands.

READ MORE: A Striking Trailer for Alfonso Cuarón's Upcoming NBC Sci-fi Series 'Believe'

In its second trailer for the film, Warner Bros. has decided to forgo the traditional promotional route by simply showcasing a two-minute single take shot from the film that serves to establish why Bullock's character finds herself alone in space, separated from Clooney and the station. It's harrowing stuff.

"Gravity" world premieres as the opening night film of the Venice Film Festival before playing at the Toronto International Film Festival. Warner Bros. opens it wide October 4.

UPDATE: Warner Bros. today dropped another single take shot take from the film, this one showing Bullock's character drifting in space. Watch below: