The 49-year-old actress, who plays Dr Ryan in the film, has received an Oscar nomination for the sci-fi thriller, reported Contactmusic.
"I worked with the nicest, kindest, most patient group of people who all had a tremendous amount riding on them because of new technology, unknown waters," Bullock said.
"It should have been a very stressful situation, but everybody was so supportive that I had one of the best filming experiences I've ever had," she added.
The film's helmer Alfonso Cuaron, won this year's Golden Globe best director award for 'Gravity'.