Quote from : The Mark of Athena Book

She led him past the engine room, which looked like a very dangerous, mechanized jungle gym, with pipes and pistons and tubes jutting from a central bronze sphere. Cables resembling giant metal noodles snaked across the floor and ran up the walls. “How does that thing even work?” Percy asked. “No idea,” Annabeth said. “And I’m the only one besides Leo who can operate it.” “That’s reassuring.” “It should be fine. It’s only threatened to blow up once.” “You’re kidding, I hope.” She smiled. “Come on.