Here we are somewhere in the middle of the long tunnel. What's that? Is there a train coming? No, it's just the light at the end of the tunnel. If it really was a train, we would be in big trouble. Although there is probably enough room up against the walls, I wouldn't want to be in here with one rumbling along these tracks. The dust alone would probably choke you. In fact, you can see the dust reflecting the light of the flash in this picture.
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