Color. The underwater world is full of colors. Fish, the most abundant and vibrant of the underwater world, are animals like us whose primary sense is sight (at least those in surface water, our diving companions). And so theirs is a world of colors, to the point that severely visually impaired animals like nudibranchs and flatworms have evolved a color code to communicate with them.
Color: those who go a little deeper experience the selective absorption of the wavelengths that make up white light, for them the world becomes green-blue, but if they have brought a torch with them... here comes the red of seaweed and corals, the bright yellow of sponges and Parazoanthus.
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