At the beginning of the movie, there is some people sail in the sea, and then they enter a big fortress door made by metal, there are some people there (like big city).
There is a method of punish in this city : someone will enter a cage, and then he will drowned to a green liquid (green thick water).
That’s all i remember about this movie.
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Audric Selected answer as best Feb 8, 2021
Thank you very much. That’s what I mean.