They were opened to the public access in the Lucky Moon of Year 439. The tunnels lead to both the notorious dungeons of the city and, eventually, the Marali Crypt .
The deeper levels of the tunnels are inhabited by Gooeys, Skeletons, Zombies, Bone Mages, Poison Elementals, Gapers and Sand Spiders. A Red Dragon and his kin can be encountered in the caverns. A less conspicuous river in the catacombs leads to a lake full of Phase Serpents.
One exit leads to an island close to the Rhovanion Rebels' guild hall.