An underwater adventure background for a children's coloring book page, featuring a colorful coral reef bustling with cartoonish fish, a sunken ship in the background. Water shimmering with light rays coming from above. Created Using: cartoonish style, vibrant underwater hues, playful fish designs, detailed coral textures, sun rays effect, clear foreground with a slightly blurred background --ar 16:9 --v 6.0 --s 750