After pocketing the money and checking the quality of each coin one by one, the one-eyed dwarf leads you down into a cellar. Its wall opens, likely activated by a secret mechanism triggered by one of your guide's friends. He grabs a torch and guides you through a maze of poorly supported corridors.
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You eventually emerge outside. Another secret door opens onto ruins largely overgrown and hidden by a coniferous forest. It appears to be an ancient place with Dwarven architecture. Your guide takes his leave and closes the secret passage. After a few steps, you leave the cover of the trees and see a rough road winding its way to 162.