Why did Thorin and Co go down the tunnel?
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The dwarves are hiding from Smaug but the stiffling air is driving them crazy. The go down into the tunnel hoping to escape and find fresh air.
Thorin spoke: "Let us try the door!" he said. "I must feel the wind on my face soon or die. I think
I would rather be smashed by Smaug in the open than suffocate in here!"
Thorin makes his way down into the tunnel, and the others follow.
The Hobbit/ Chapter 13