: This likely refers to the audio and subtitle configuration. "5.1" is a common surround sound configuration used in home theaters and movie theaters, and "ESub" could imply that there are English subtitles.

The film takes place in the near future, where astronaut Dr. Ryan Stone (Sandra Bullock) is on her first space mission, accompanied by veteran astronaut Matt Kowalski (George Clooney). Their mission is to repair the Hubble Space Telescope. However, their task becomes a desperate fight for survival when a catastrophic accident occurs, destroying their shuttle and leaving them adrift in space.