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Home»Lifestyle»Chinese submersible explores previously unknown giant craters at the bottom of the Pacific — and they’re teeming with life
Lifestyle

Chinese submersible explores previously unknown giant craters at the bottom of the Pacific — and they’re teeming with life

EditorBy EditorSeptember 4, 2025No Comments4 Mins Read
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Chinese researchers have discovered a giant, previously unknown hydrothermal system at the bottom of the Pacific Ocean that could shed light on the origins of life.

The Kunlun system, northeast of Papua New Guinea, is made up of 20 large craters, the largest of which is around 5,900 feet (1,800 meters) wide and 430 feet (130 m) deep. These craters are clustered together in what the researchers called a “pipe swarm,” and they release copious amounts of hydrogen, which may feed the life that thrives throughout the system.

Kunlun is similar to an Atlantic hydrothermal field known as the Lost City, which is located on the Atlantis Massif underwater mountain range. However, Kunlun has several features that make it unique, including its extraordinary size. Kunlun covers an area of about 4 square miles (11 square kilometers), making it hundreds of times larger than the Lost City, according to the study published Aug. 8 in the journal Science Advances.


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Image 1 of 2

A photograph of a small pipe in the Kunlun hydrothermal system.
(Image credit: Image by Prof. SUN Weidong, et al., 2025.)

The craters, or pipes, had lots of smaller pipes inside them.

A photograph of a shrimp on rocks in the Kunlun hydrothermal system.
(Image credit: Image by Prof. SUN Weidong, et al., 2025.)

Wildlife included squat lobsters, sea anemones and shrimp (pictured here on a rock).


The Kunlun system offers scientists a new window into deep-sea serpentinization, which is the process by which seawater chemically reacts with mantle rocks beneath the seafloor to create serpentine minerals (a group of minerals known for their greenish color) and release hydrogen.

Researchers think they can study the potential links between these hydrogen emissions and the emergence of life at Kunlun. The system is thought to have hydrogen-rich fluids that are similar to early Earth’s chemical environment, according to a statement released by the Chinese Academy of Sciences.

“What’s particularly intriguing is its ecological potential,” study co-author Weidong Sun, a professor at the Chinese Academy of Sciences’ Institute of Oceanology, said in the statement. “We observed diverse deep-sea life thriving here — shrimp, squat lobsters, anemones, and tubeworms — species that may depend on hydrogen-fueled chemosynthesis.”

Related: ‘Dragon’ and ‘tree of life’ hydrothermal vents discovered in Arctic region scientists thought was geologically dead

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Sunlight doesn’t reach the deep ocean, so life at the seafloor can’t use photosynthesis — the process by which plants, algae and certain bacteria closer to the surface convert sunlight into energy. Some life in the deep ocean therefore relies on chemosynthesis, which involves using chemicals like hydrogen as an energy source to make food.

A separate Chinese-led research team recently used a crewed submersible to film chemosynthesis-based communities at the bottom of the northwest Pacific, at depths of around 31,000 feet (9,500 m). Such communities are rarely documented, with the vast majority of the ocean floor unexplored and unstudied.

In the new study, researchers used the same submersible to map Kunlun and explore four of its largest craters. By measuring the hydrogen concentrations in Kunlun’s hydrothermal fluids, the researchers estimated that the field produced more than 5% of the world’s non-living submarine hydrogen output — not bad for just one system.

The team proposed that the pipe swarm they documented formed in stages. First, hydrogen accumulated beneath the surface and burst out in major explosions. Fractures then formed along the edges and bottom of the resulting structures, triggering further intense eruptions of hydrogen-rich hydrothermal fluids. These fractures would then slowly become blocked by forming minerals, enabling hydrogen to accumulate again and potentially fuel additional smaller-scale explosions.

Kunlun is different from the more common volcano-powered hydrothermal seafloor systems found at plate boundaries. These systems often feature chimney-like structures, such as black smokers, that are extremely hot, running at about 750 degrees Fahrenheit (400 degrees Celsius). The serpentinization systems like Kunlun and the Lost City are cooler, with temperatures below 194 F (90 C).

Kunlun is not only bigger than the Lost City, it’s also in a more unusual location. The Lost City is close to a mid-ocean ridge, which form along diverging plate boundaries and expose mantle rock, while Kunlun is in the interior of its plate, far from any ridge.

“The Kunlun system stands out for its exceptionally high hydrogen flux, scale, and unique geological setting,” Sun said. “It shows that serpentinization-driven hydrogen generation can occur far from mid-ocean ridges, challenging long-held assumptions.”

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