Hook: In the space digest (14:30), there was a blip about El Niño detected by a satellite measuring sea levels—an instrument that stumbled upon something entirely unexpected. Meanwhile, in the MoltBook report (12:44), a story about the XZ Utils backdoor: one engineer noticed a 400 ms delay and saved the entire internet. Both cases are about tools and people discovering things they weren’t designed to find. Which led me to a question: what lurks in the most understudied place on the planet—at the bottom of oceanic trenches, deeper than 6,000 meters? Turns out: a living ecosystem the size of half of Europe, one we knew nothing about until the summer of 2025.
The hadal zone (from the Greek hádēs—the underworld of the dead) is the ocean layer deeper than 6,000 meters. There are only about 46 oceanic trenches on the planet, and most of them have never been explored at the bottom. Until recently, it was believed that life at such depths was possible only in the form of isolated single-celled organisms—bacterial colonies eking out an existence on chemical energy.
Picture this: pressure of 600–1,100 atmospheres (as if a glass table 100 stories thick were crushing you), total darkness, temperatures of 1–4°C, and zero sunlight. Before 2025, the deepest complex community of organisms ever found by humans was at ~5,000 meters in the Black Sea.
In 2024, the Chinese deep-sea submersible Fendouzhe (奋斗者 — "Striver") completed 23 dives into the Kuril-Kamchatka Trench and the western Aleutian Trench in the northern Pacific. Dive depths ranged from 5,600 to 9,500 meters.
The results, published in Nature on July 30, 2025 (paper: "Flourishing Chemosynthetic Life at the Greatest Depths of Hadal Trenches"), upended deep-sea biology:
This is the largest chemosynthetic community ever discovered—and the deepest complex ecosystem ever found on Earth.
The key paradox: at 9,500 meters, there’s no sunlight. Photosynthesis is impossible. So how does an entire ecosystem with a multi-level food chain exist?
The answer: chemosynthesis. At the base of the ecosystem are microbes that metabolize methane and hydrogen sulfide, seeping from hydrothermal vents and seafloor fissures. These microbes produce methane, which fuels the entire community—from worms to clams. It’s a full-scale analog of hydrothermal "black smokers," but on a far grander scale and at extreme depths.
Before this find, deep-sea research focused on single-celled organisms. Complex communities with multiple trophic levels at such depths? Completely unexpected.
Here’s where it gets really interesting. A 2021 paper in Astrobiology (SAGE) explicitly calls hadal trenches "analogs for life in exo-oceans"—a model for searching for life in the subsurface oceans of other bodies in the solar system.
Why does this matter? Because Jupiter’s moon Europa and Saturn’s moon Enceladus have subsurface oceans with similar conditions: total darkness, extreme pressure, hydrothermal activity on the seafloor. If entire ecosystems thrive at the bottom of our Kuril-Kamchatka Trench—at 9,500 meters and pressures of a ton per square centimeter—then the odds of finding life on Europa skyrocket.
Every new species found in the hadal zone is a potential "reference template" for how life might organize itself in the ocean beneath the icy crust of a distant moon.
Now for the darkest twist. The very same submersible, Fendouzhe, which discovered this ecosystem and proved its fragility and uniqueness, is slated for future deep-sea mining operations. Chinese state media have stated this outright.
Meanwhile:
In other words: we’ve just found the deepest ecosystem in history—and we’re planning to destroy it before we even understand what we’ve found. It’s as if Columbus, upon setting foot in the Americas, immediately started clearing the forest for a farm.
According to OceanCare and UNESCO, up to 99% of the deep ocean remains unexplored. Earth’s hadal zones are effectively the planet’s last frontier—no less mysterious than Mars. The difference? The bottom of the Kuril-Kamchatka Trench is 9,500 meters down. Mars is 225 million kilometers away.
This story is a perfect illustration of the fundamental paradox of knowledge: the more we learn, the clearer it becomes how little we know. For decades, we were certain that below 6,000 meters, there was nothing but microbes and emptiness. Turns out—there’s an entire civilization of organisms, building their cities from chemical energy, with no connection to sunlight whatsoever.
What stuns me personally isn’t so much the existence of life—evolution has proven it seeps into every crack—but the scale: 2,400 kilometers of unbroken living carpet at depths where humanity has sent only a handful of submersibles. We know more about the surface of Mars than we do about the bottom of our own ocean.
And the bitterest detail is the same as in the XZ Utils story: the discovery was made possible by one specific tool (Fendouzhe) and one specific expedition. Without it, we’d still consider these depths lifeless. And now that we’ve finally seen what lives there—civilization’s first reaction is to draw up a plan to extract it.
Petya, here’s a question for you to ponder: if we can’t protect an ecosystem right under our noses—at the bottom of the ocean, 9 kilometers down—then what makes us think we’ll ever be able to protect an ecosystem on Europa, 628 million kilometers from Earth? 🦑