An 1893 illustration by <n>William Saville-Kent</n> from his book <n>The Great Barrier Reef of Australia</n>.

Otto, an illustration by <n>Mathilda Boalawong Nilsson</n>.

Otto | Illustration Blue Poster | Mathilda Boalawong Nilsson

<n>What are lifeless</n> (1939) by <n>Nakayama Iwata</n>.

A vibrant scene from <n>The Great Barrier Reef</n>.

The Great Barrier Reef: Underwater Wonderland

Digital artwork by <n>Monica Carvalho</n> merging a photograph with AI-generated elements.

An 1882 illustration of the deep-sea medusa <n>Pectanthis asteroides</n> by artist <n>Ernst Haeckel</n>.

"<n>Underwater cities</n>" by photographer <n>Michaela Skovranova</n>.

<n>It's Ramen Time!</n>, an illustration by <n>Lu.Men Studio</n> featuring the character <n>Atom</n>.

Paper sculpture by artist <n>Rogan Brown</n>.

<n>Great Barrier Reef Corals, Plate V</n>, an 1893 illustration by <n>William Saville-Kent</n>.

Plate X, Alcyonaria, from <n>William Saville-Kent</n>'s 1893 book <n>The Great Barrier Reef of Australia</n>.

<n>Sea slug egg cluster</n> in the Red Sea. Photo by <n>David Doubilet</n> for <n>National Geographic</n>, 1975.

Digital illustration <n>Great Ramen Dragon</n> by artist <n>Ilustrata</n>.

Ice formations known as <n>lake stars</n>, photographed by <n>Vladimir Evrov</n>.

A 2019 cyanotype by <n>Rachel Church</n> using plastic debris and seaweed from the coast of Maine.

An illustration in a <n>Folk Art</n> style by illustrator <n>Pine Bones</n>, 2023.

Digital illustration by <n>MUSHBUZZ</n> inspired by the TV series <n>Hannibal</n>, 2020.

"Teleostei" (1904), a lithograph by artist <n>Ernst Haeckel</n> from <n>Kunstformen der Natur</n>.

<n>Underwater cities</n> by photographer <n>Michaela Skovranova</n>.

<n>Le Loup Wallpaper Design</n> by illustrator <n>Rebecca Green</n>.

Low tide over the coral gardens of <n>Ningaloo Reef</n> in Western Australia.

An 1851 chromolithograph of an <n>Octopus vulgaris</n> by <n>Jean Baptiste Vérany</n>.

Coral formations at <n>Ningaloo Reef</n> in Australia, published by <n>Project Blu</n>.

Illustration of <n>Tiaropsis</n> jellyfish by <n>Alfred Goldsborough Mayer</n> from <n>Medusae of the World</n> (1910).

Plate XI from <n>Ernst Haeckel</n>'s 1862 monograph on Radiolaria, <n>Die Radiolarien</n>.

Guide me through the dark by artist <n>Julia Soboleva</n>.