Kowloon Walled City episode from "Long Arm of the Law" (1984)

English subtitles are available.

"Far better all round, both as a film and for its views of the Walled City’s interior, is Johnny Mak’s Long Arm of the Law, the classic story of a robbery gone wrong with the robbers fleeing to the Walled City hoping, in vain as it turns out, to escape the chasing police force. Amazingly, the film’s entire denouement, the final part of the movie, is actually filmed within the Walled City’s alleys and stairways – a technical achievement in itself, not to mention the interesting negotiations with local Triad leaders it must have involved."

City of Darkness: Revisited