Spiritual Meaning:
As a place of hidden forces and occult power, in dreams the catacomb will represent the unconscious. Catacombs suggest interlinking ideas or principles while a crypt is complete within itself.

Psychological / Emotional Perspective:
Our subconscious fears or feelings connected with death can show in a dream as a catacomb or crypt. Inherent in both is the idea of sanctuary for the soul.

Everyday Material Aspects:
Many dreams contain images which are to do with a space underground, and to dream of a crypt or a catacomb signifies a need to come to terms with subconscious religious beliefs or training.

You might like to consult the entry for Tomb.