A crawl space is cramped, dark and rarely visited, read as a corner of the mind holding forgotten fears or memories. Squeezing through it stands for working your way through a tight situation.
Has this come up in your dreams before? What was going on in your life then?
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.