The special effects are top notch, very superior to the Hollywood standards of its time (just compare this film to "San Francisco", made five years later). Most reviewers write about how realistic this film is, but the mine interior was entirely recreated in studio. And it looks like a real claustrophobic coal mine. Amazing! Technically it is superb. About the story and the message a lot has been said, so no need to repeat how good and necessary this film was. I saw it with the epilogue sequence included. Sad end, but it is realistic in this point too. Good intentions meet the old dark forces. Just read Oscar Wilde's "The young king". Its end is even more pessimistic. At least, Pabst opens a door to fight and hope. The closed frontier is only an advice: beware! the fight won't be easy.