"The studio's film vault, which is lined in concrete and lead and contains irreplaceable film negatives, was not affected."
http://www.variety.com/article/VR1117986693.html?categoryid=13&cs=1
"Fortunately, nothing irreplaceable was lost," said Ron Meyer, CEO of Universal Studios. "The video library was affected and damaged, but our main vault of our motion picture negatives was not."
http://edition.cnn.com/2008/US/06/01/studio.fire/index.html