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I'm looking for a movie that I saw as a child in the 80s. It was a post-apocalyptic world with a group of survivors. They were in a deserted area. Once they entered a tunnel where the floor was covered in water. And here water amazons / sirens appeared that tried to drag them down. Could you help me identify this movie?
Edit: I think it was an American movie. The group entered the tunnel in a Mad Max-like car. If I remember correctly, there was an African-American guy also in the group. The set was deserted / rocky.