Scientists discovers light-independent ecosystem deeper than Mount Everest

While most lifeforms on Earth needs light to live, this hidden world twists such narrative.

During a deep water expedition in the Kuril-Kamchatka and Aleutian trenches of the Northwest Pacific ocean, scientists discover a thriving ecosystem of organisms sitting at the sea bed where even light itself can’t reach.

The deepest place where these communities were seen was in the hadal zone, marked at  31,276 feet below the ocean surface, a depth greater than the height of Earth’s highest point, Mount Everest—such depth is far deeper than any documentation of similar creatures. 

“The ocean environment down there is characterized by cold, total darkness and active tectonic activities,” International Deep-sea Science and Engineering (IDSSE) marine geologist and study co-author Xiaotong Peng, leader of the research program said.

Here, the species observed were mostly gastropods—creatures which are typically snails, slugs, or sea slugs located in various habitats. They serve as food source for higher organisms in the food chain. 

Specifically, the community found is dominated by red, gray or white tube worms and white clams that filled a great area in the seabed.

“What makes our discovery groundbreaking is not just its greater depth—it’s the astonishing abundance and diversity of chemosynthetic life we observed,” said marine geochemist Mengran Du of the IDSSE. 

Due to the levels in which these organisms are living, no amount of light can reach them, making their case very rare as to how they live without the light energy that every other living thing in the planet needs. 

While most creatures on Earth rely on a food chain that starts from organisms which feed on light through the process called photosynthesis, these deep-sea beings’ hierarchy begins with the process of chemosynthesis. 

Chemosynthesis  is a biological process where instead of light being consumed by autotrophs—organisms that create food for themselves and are at the lowest part of the food chain—they use chemicals like methane and sulfur as energy for food production. 

This is possible due to the seeps of said chemicals that come from the sea floor which are consumed by bacterias, which in turn gets eaten by higher-level organisms. 

“Even though living in the harshest environment, these life forms found their way in surviving and thriving,” Du said.

Although there are creatures found deeper than the discovered ecosystem, they are not chemical consumers, instead they sustain themselves by eating organic matter and dead marine creatures that filter down from above.

According to Peng, the environment found harbors the deepest and the most extensive chemosynthetic communities known to exist in the planet.

The hadal adventure was made possible by the scientists’ three-person submersible called Fendouzhe—a China-developed submersible capable of reaching the deepest parts of the ocean, and is instrumental in the journey towards Mariana Trench. 

“Diving in the submersible was an extraordinary experience—like traveling through time. Each descent transported me to a new deep-sea realm, as if unveiling a hidden world and unraveling its mysteries,” Du commented.

In addition, the researchers suggest that there is a high possibility for more chemosynthesis-based ecosystems located in extraterrestrial—or beyond Earth—oceans where methane and hydrogen chemicals are abundant. 

This would mean that there is a real chance of alien life as IDSSE says that extraterrestrial oceans refer to bodies of liquid found beyond Earth, which are typically beneath ice surfaces of moons like Europa, Enceladus, and Titan. 

Furthermore, the research stretches the potential of life in Earth; how ecosystems can rely on chemicals rather than light to support the food chain. 

“These findings extend the depth limit of chemosynthetic communities on Earth. Future works should focus on how these creatures adapt to such an extreme depth,” Peng claimed.

Such discovery proves that there is still a lot more to shed light on Earth, and as scientists dive deeper into more astounding depths of the darkest regions of the planet—bigger, more complex yet astonishing ecosystems of organisms can be unravelled.