How does the setting in "The Cask of Amontillado" function in creating atmosphere and an antagonist?

Poe, the master of creepy stories about creepy people, in the setting of this story, found what is perhaps the creepiest possible setting.  They are in dark, mazey, damp, rat and insect-infected tombs.  It doesn't get more eerie than that.  Ironically, the setting isn't for a sudden zombie-uprising, as modern Hollywood might make it today, but rather the setting for the twisted plans of Montresor to commit his premeditated act of revenge. One can easily imagine his success in this setting, and sense the feeling of doom and despair.  The setting can also represent Montresor's mind, which is full of ill-intent, death, and revenge to be buried forever.

The setting itself works against the unfortunate Fortunado, as an antagonist: The damp and cold impacts his cough, the narrow and winding passageway disorients him, and the depth of their penetration into the old catacombs ensures he won't be discovered in his tomb.  In this way, the setting aids and abets Montresor in his crime, and becomes a supplementary force for evil in the story.