I was the sequence supervisor on the building collapse scene.

It was some of the heaviest scenes I have ever worked with. Since the building
was all glass, we had to ray trace it which meant we had to have everything (and
I mean EVERYTHING) loaded at once. Some scenes would take almost an
hour to load. Rendering on some frames took as long as 288 hours!
Luckily we could run it on multiple computers at once.