In the slums of Kowlon level there is an achievement for taking the top path in one of the sewer bits without falling into the water below. When you take the top path (you have to dive onto it) the floor will crumble and you will most likely fall. Take the bottom path first and the path above will crumble. Then go back and take the top path. The path will not fall now and you can make your way easily across to get the achievement.
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