The protagonists are told they have been exposed to an "E.B.E." (Extraterrestrial Biological Entity).

They realize the facility is surrounded by a vast, canyon-like desert.

Despite its low budget, the film uses anamorphic lenses to create a "big budget" cinematic feel.

Uses a heavy, atmospheric score and sharp transitions between silence and industrial noise to heighten paranoia. The Ending Explained

The film is divided into three distinct acts, each shifting in tone and visual language: Act I: The Road Trip

Some critics found the plot to be "style over substance," with a convoluted second act. Rotten Tomatoes: Generally sits in the 60% range (Fresh). I can provide more detail if you're interested in: