The tunnel in a dream represents the dark and dangerous path that one must take in order to reach the light. The tunnel in a dream represents your fears or anxieties about trying something new or changing your life for the better. It may also represent an obstacle, which needs to be crossed over, or an enemy that needs to be escaped from.
The suggested remedy for this is doing things like taking small steps towards change while shinning a light at your concerns and being open-minded about it.