Sunlight ... Cool!

As you’re crawling through the tunnel, you hope it gets bigger quickly. At one point, you almost get stuck, but some creative wriggling gets you through. The tunnel begins getting a little taller, and finally you are able to walk again. Around a corner, you enter a circular room with a domed-like ceiling. At the top of this dome, sunlight was shining into the room, illuminating a spot on the wall across from where you stand.

Two exits make themselves apparent: Both have upward slopes in them - your heart races as you know one might carry you to the surface and escape. They look very similar. Which one do you want?

The Left Tunnel
or The Right Tunnel?