Heads up, Ariel: There's something positively mind-blowing going on under the sea.

These absolutely gorgeous photographs just made a big splash in the international Underwater Photographer of the Year competition for 2018. The annual contest showcases more than 100 of the world's best photos captured in oceans, lakes, rivers, and even swimming pools. With winners in 11 categories, including portraits, wide-angle, and wrecks, the competition brings out seasoned professionals and rising stars in this beautiful — albeit somewhat soggy — hobby.

Underwater photography greats Peter Rowlands, Martin Edge, and Alex Mustard judged more than 5,000 entries to crown the winners. Here are 19 of the best, including Tobias Friedrich's "Cycle War," the image named photograph of the year.

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Tasked with revealing the planet's most beautiful sights, nature documentarians often hope they inspire people to get involved with conservation. But this film crew decided to start saving the Earth themselves.

On Sunday, the BBC Earth Twitter account confirmed that the filmmaking team behind their spectacular dive into the ocean's hidden depths, "Blue Planet II," didn't stop at capturing the magic of the ocean.

"Blue Planet II" is a sequel to the BBC's blockbuster 2001 special and uses cutting-edge camera equipment technology (like suction cup cameras sneakily attached to orca whales) and the melodious voice of Sir David Attenborough, to show the audience both the wonders of the ocean and the problems facing it today.

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This is what it looks like when a piece of coral dies.

GIF via Netflix/Exposure Labs/YouTube, from the film "Chasing Coral."

This is a phenomenon known as coral bleaching, now captured in the award-winning documentary "Chasing Coral." To get these impressive shots, a team of photographers, divers, and scientists traveled the world to capture time-lapse photographs of coral bleaching events.

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Back in 2016, this is what we saw on the ocean floor.

‌Image courtesy of NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas.

It was found by this little dude:

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