I've read about the atrocious English language dub, but my copy of the film is the Dutch rental video with the original German dialogue and it sounds fine. The film itself is gritty and realistic in tone. Five astronauts return from years in space only to find a seemingly desolate Earth. No radio signals, deserted ruins, sparse vegetation etc. At loss at what to do next they decide to head North, but without sufficient food and water supplies, how long will they last? The line between reality, hallucinations due to dehydration (and possible radioactive sickness) and flashbacks to their exploration of Jupiter moon Ganymedes is constantly blurred. Recommended.
Review of Operation Ganymed
