An ice cave is a hidden room of the self where feelings have been frozen and preserved. Tradition reads its blue light as a cold beauty, and entering it as approaching emotions long kept still.
When this appeared in your dream, what were you feeling?
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.