Montresor gives Fortunato more wine to make him more drunk. Fortunato is now passed out. Once Montresor and Fortunato are deep in the catacombs , Montresor chains Fortunato inside the hole in the catacombs. Then, Montresor starts laying the brick to lock him in the hole.
Then, Fortunato wakes up from unconsciousness and realizes Montresor is trying to lock him inside by building a brick wall into the hole. Fortunato starts screaming and now Montresor is scared that his plan won't work. Finally, Montresor continues to to lay the brick and as he lays the last one, Fortunato realizes he is going to die and gives up on trying to get Montresor to let him out.
No one bothers Fortunato deep down in the Montresor catacombs for 50 years.