Mexico, Baja California, Sea of Cortez, Cabo Pulmo. As soon as I got in the water, I was greeted by thousands of Jacks, swimming peacefully and creating all kinds of beautiful silhouettes. It is very hard to understand the immense size of the school by looking at a picture, so I waited for my dive buddy to go to the bottom, some 60 feet below, to give a sense of scale to the image and convey the impressive magnitude of the scene.