a simple megalodon in the foreground, coloring book for adult, Ruins of an ancient underwater civilization, with fascinating architecture and submerged statues background, black adn white, easy coloring book page, simple cartoon style, high quality, high resolution, clear white background, crisp thick lines, outline, black and white only, shapes with bold black lines, relaxation, simple line art, printable outline art, thin lines, crisp line --ar 3:4