This was taken with a flash so that you can see what the tunnel wall looks like. The bright spots are reflective tape at the top and bottom of each post. The dimmer spots are the actual lights. Wall to wall the tunnel is around 4 to 5 feet wide, and mostly less than 8 feet tall. Most people can touch both walls at the same time, and the roof is within reach in most spots. It may be coincidence that the tunnel dimensions are approximately the same as the dimensions of the first tunnel through the crater wall, which was built for mule traffic. Or maybe they ran mules through this tunnel too. This is looking downhill towards the mouth of the tunnel.

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