The seabed is the deepest floor of the unconscious, and reaching it is read as touching something fundamental and long hidden. Dream books link objects found there to forgotten memories.
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.