Actress Sandra Bullock revealed Saturday at Comic Con that she had to spend 10 hours a day locked in a 9-by-9-foot cube for her upcoming movie Gravity.

Yahoo reported on July 22 that inside the cube, Bullock was strapped in a harness that kept her immobile.

"There was no improvising. The physical part was so scary," Bullock said. If being kept in a cube wasn't hard enough, director Alfonso Cuarón used a special camera that rushed towards her face at 25mph, stopping an inch away. 

"What was even scarier than that was the technology was being created on the spot," Bullock said. "If that robot did decide to continue through my face, I couldn't have gotten out of the way." 

Yahoo also reported that the crew reated the cube to get footage that would simulate the look of an astronaut floating through the darkness of space in an accuarate way.

"The cube was designed to continually capture her point of view while floating alone in space," Cuarón said.

To keep from going crazy in the cube the actress said she meditated and listen to CDs that the director gave her. 

Though staying in a cube smaller than a prison cell for 10 hours sounds awful, it's much better than Cuarón's original plan to send Bullock and co-star George Clooney into a the Earth's statosphere in a reduced-gravity airplane. The "vomit comet" would enter periods of free fall, dropping thousands of feet per second.