The digitally-mastered German short film “Gone Underground,” a selection for this year’s Sundance Film Festival, is a mysterious trip. Katja, a beautiful and enigmatic woman, rides on a German subway train with three other passengers: a dotty old lady, a shady man, and a careless boy. When the group unexpectedly plunges into darkness en route to their destination, another twist is added to the tale.
The short lives online at [ the “Gone Underground” homepage ] , and the site features storyboards from the film, a cast gallery, production notes, and much more. It’s a quick ride you won’t soon forget.