There is only one way through a tunnel: forward, with confidence. Take off your shades and turn on your headlights. Aim for the light at the end of the tunnel, which may not be visible until you're almost there.
Trust that the engineers did their jobs well and that the structure is sound. Trust that those around you are moving forward, with confidence, like you. Trust that the tunnel is not so long that your focus narrows permanently.
Going through a tunnel, you, of course, remember what's on the outside of it. You know what daylight is, and you know how to work your peripheral vision. But while you're going through the tunnel, you have to focus on just one thing: moving forward.
When you reach the outside again, after you adjust to the brightness, you'll need to look around and broaden your awareness. Hey, loosen up a bit.
The tunnel is a neat way to go from somewhere to another place. But it's no place to live.
