Short film "Trapped"

Some friends of mine made a short film and uploaded it on youtube. It is in German, but if you turn on the annotations you'll get English subtitles, there is not much talk in there anyway. Would be cool if you could check it out and pass the link on to friends if you like it:
http://www.youtube.com/watch?v=NC0DMdP59K4

That's pretty awesome x) the ending confused me though!