We now know Sarah Yoon's To the Moon is not the tallest coloring book in the world—it has a twin, this equally fantastical dive into the deepest ocean imaginable, and it too unfolds to a dizzying 15-foot height. Swim down, down, down past secret caves and fishy habitats, a sunken pyramid and an underwater forest, submarines and city domes, giant sea snakes and whales, a pagoda and a Statue of Liberty, and even a scuba-equipped T-rex. You can use pencils, markers, or paint to color this crazy adventure, and look for Yoon's adorable little aliens making mischief along the way.