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Pufferfish Creating Beautiful Underwater Mandalas–A Scene of Pure Peace Elaborate circles of sand and pebbles have been spotted off the coast of a Japanese island. Prior to 2011, these strange, mandala-like circles found under the shallow sea were a mystery, and the identity of their architects was anything but expected. They are constructed for an annual mating ritual....

Diver begins filming pregnant male seahorse not knowing its time had come Seeing a pregnant male seahorse is one thing but to witness them give birth is another thing entirely.

Every morning, seahorse couples engage in ritualistic dances to greet each other, moving through intricate, rhythmic sequences of twists and twirls for minutes to hours on end. While we humans may schedule dates with romantic prospects to analyze our compatibility and get to know each other better, seahorses prove we’re not the only species that ‘date!’

They engage in their daily dances to strengthen their romantic bond, ensure their reproductive cycles are properly synced and to verify each day that their partner is both still fervently committed and, frankly, alive (hey, that’s kind of important).

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Solar panels, cell phones, and electric car batteries rely on rare earth metals–and that demand is fueling mining companies' interest in the sea floor.

What's at stake? Marine microbes—which produce oxygen and capture carbon—are at risk of becoming collateral damage. Find out what this could mean for the deep-sea ecosystem in our latest Oceanus story.

📸 : Manganese nodules in the Clarion Clipperton Zone (courtesy of Geomar)

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Jaw-Dropping Video Shows Blue Whale Chowing Down on Krill A drone captured the giant cetaceans plowing through krill clouds to get their fill