He's a Cyclops.They work the forges of the gods. They have to be immune to fire. That’s what I was trying to tell you.

Annabeth Chase, in The Sea of Monsters

The Underwater Forges of the Cyclopes are the forges of Hephaestus, the blacksmith god. The Cyclopes work in the forges and makes weapons for Olympus.

Percy Jackson and the Olympians

The Sea of Monsters

According to Annabeth Chase, Cyclopes work in the forges of the gods. These forges are located underwater, in Atlantis, Poseidon's kingdom. Not much is known about its setting except that it the workers have to work in volcanic conditions.

The Cyclopes have apparently always worked with Hephaestus. One of these forges, where Hephaestus creates metal monsters, is mentioned to be located in the Sea of Monsters.

The Titan's Curse

Percy sends an Iris Message to Tyson, who is working in the forges to make weapons.


Tyson, a Cyclops that works in the forge.

The Last Olympian

After Percy Jackson is blown off the Princess Andromeda, he sinks to the bottom of the ocean to Poseidon's Palace. There he hears Tyson talk about how Briares is teaching the Cyclopes the old ways of making weapons. While Tyson does enjoy working in the forges to make weapons, he feels he would do better on the front lines helping their father fight Oceanus, who has been attacking Atlantis.

Later, the Titan army invades the forge, and Tyson leads the other Cyclops into battle against them. The result of the battle is unknown as Poseidon appears later to aid in the defeat of Typhon, and although the current state of the forge is unknown, but it has presumably been rebuilt.


Locations (CHB)
Magical Locations: Aeolia | Camp Half-Blood | Camp Jupiter | Cave of Trophonius | C.C.'s Spa and Resort | Daedalus' Workshop | Lotus Hotel and Casino | Mount Othrys | Ogygia | Olympus | Pan's Cave | Sea of Monsters | The Labyrinth | Tartarus | Underworld | Waystation
Cities, States, and Towns: Alaska | Bar Harbor | Bologna | Chicago | Detroit | Gila Claw | Indianapolis | Jamestown | Montauk | New Mexico | New York City | Palm Springs | Quebec | San Francisco | Dalmatia | Vancouver | Venice | Westport
Other Locations: Apennine Mountains | Aunty Em's Gnome Emporium | Carlsbad Caverns | Crusty's Water Bed Palace | Empire State Building | Gateway Arch | Grand Canyon | Greece | Hoover Dam | Italy | Junkyard of the Gods | Mount Diablo | Mount Etna | Mount Saint Helens | Mount Tamalpais | Pikes Peak | Polyphemus' Island | ROFL | Rome | Triple G Ranch | U.S.A. | Waterland