When Percy Jackson and Annabeth Chase investigated Mount Saint Helens for Hephaestus, they locate a group of Telekhines forging the blade of Kronos' scythe. Percy called upon his power and caused the mountain to erupt. This weakened the seal on Typhon's prison and lead to a reaction within the mountain that awakened him. It was reported that numerous illnesses and minor injuries were caused by the eruption. In addition, half a million people in the area were evacuated.
The mountain kept erupting and was soon obliterated, torn apart and completely destroyed when Typhon escaped from under the mountain.
- In real life, Mount Saint Helens was almost completely destroyed during an eruption in 1980.
- During the 1980 eruption, the mountain lost 1,300 feet off of its peak.
|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|