A manhole is an entrance to the hidden underside of the city, read as access to the unconscious or to matters kept below the surface. An open manhole stands for a hidden risk you sense on your path.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.