You have to think of each stage of the movie and how it progresses, get into the state of mind of the character, and then match the camera to that, and keep making it tighter and tighter and crazier and crazier so people don't get bored. You know you cannot do a similar shot that you did at the beginning of the movie at the end.

I could only shoot when the subway was on the other platform. Little things like that, and the platform is very narrow. It's not like you can hide if a subway comes so a lot of things happened because of that. Or a thousand people just came and looked straight into the lens like they didn't expect a movie to be shooting.

I wanted to move away from the disaster airplane movies that we have seen in the past and do something that was more mysterious, and delay until the end the resolution of the mystery, and then have to deal with the plane itself.

I will shoot on film as long as they make it.

I think that everything changes when it goes through the Mac; it's cheap. I think people then don't pay too much importance to the take, if you can do 40 takes.

If you do any thriller or horror movie a big part of the process is accounting for the cell phone.

Producers and studios want to make movies that are more appealing internationally and I think that you have to use your different cultures as an advantage to be able to make those movies.