Quote from : The Mark of Athena Book

Percy tightened his grip on Annabeth's wrist. His face was gaunt, scraped and bloody, his hair dusted with cobwebs, but when he locked eyes with her, she thought he had never looked more handsome. "We're staying together," he promised. "You're not getting away from me. Never again." Only then did she understand what would happen. A one-way trip. A very hard fall. "As long as we're together," she said. She heard Nico and Hazel still screaming for help. She saw the sunlight far,f ar above-maybe the last sunlight she would ever see. Then Percy let go of his tiny ledge, and together, holding hands, he and Annabeth fell into the endless darkness.