A dream with a tunnel suggests that you need to raise your self awareness in some way or explore things more. It also suggests the need to focus on the end result of something or the need for security.
To see a light at the exit of the tunnel implies that you are nearing the end of something you have been digging deeper into or that there is hope for you.
A blockage in the tunnel represents something holding you back from progressing in some aspect of your life.
To come out of the other end of the tunnel suggests that you have overcome some form of anxiety in your life.