As Annabeth hung in the air, descending hand over hand with the ladder swinging wildly, she thanked Chiron for all those years of training on the climbing course at Camp Half-Blood. She’d complained loudly and often that rope climbing would never help her defeat a monster. Chiron had just smiled, like he knew this day would come.
Finally Annabeth made it to the bottom. She missed the brickwork edge and landed in the canal, but it turned out to be only a few inches deep. Freezing water soaked into her running shoes.

The Mark of Athena, Chapter XXXIV