A four-and-a-half year project for the crew, involving animating the entire movie and soundtrack, and then choreographing almost every movement with actors, state-of-the-art motion control robots, incredibly detailed and seamless CGI (meaning in most of the spacewalk shots, the only 'real' thing are the actor's faces - their bodies and environment are CGI). 

Trailer:

Sound Design:

The other side of Ryan's concluding conversation (a short film to accompany Gravity)