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Uncovering The 'Lost City' - A Bizarre Underwater World Unlike Anything On Earth

Damjan
by Damjan
10 Sep 2025

Somewhere beneath the ocean, a “lost city” is quietly doing what no underwater city should be able to do, growing towering spires like it’s building itself from the inside out. The Poseidon monolith, bigger than a six-story building, is just one landmark in this bizarre hydrothermal maze.

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And here’s where it gets messy. In 2018, Poland secured rights to mine the deep sea around the hydrothermal field, even though the Lost City itself likely won’t take a direct hit. Still, the surrounding ecosystem is the whole deal, and Science Alert warns that messing with nearby vents could trigger surprises no one can fully predict.

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Between the ROV footage of monoliths and the calcite vents feeding bacteria, this is one story where discovery and damage are swimming in the same direction.

Watch the video:

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On the left, a remotely operated vehicle examines the towering spires of the Lost City; on the right, bacteria thrive on a calcite vent.

On the left, a remotely operated vehicle examines the towering spires of the Lost City; on the right, bacteria thrive on a calcite vent.
D.Kelley/University of Washington

The ROV on the left is busy inspecting Poseidon-sized spires, while on the right, bacteria are thriving on a calcite vent like they own the place.

Then the news drops in 2018, Poland securing deep-sea mining rights around the hydrothermal field, and suddenly the “unaffected” label feels a little too neat.

The tallest of the Lost City’s monoliths has been named Poseidon, after the Greek god of the sea, standing at more than 60 meters high.

There is growing support for designating the Lost City as a World Heritage site, with many urging protection of this extraordinary natural formation, especially given humanity’s history of damaging fragile ecosystems.

In 2018, it was confirmed that Poland had secured rights to mine the deep sea surrounding the hydrothermal field.

While the Lost City itself is not expected to be directly affected, Science Alert points out that disrupting the nearby environment could lead to unforeseen consequences.

This Lost City’s alien vents and spires feel like the deep sea world that looks almost unearthly.

That’s when the World Heritage talk starts heating up, with people arguing the Lost City is fragile, and history has shown ecosystems do not bounce back on schedule.

The Ecological Significance of Underwater Discoveries

So while scientists keep mapping the underwater world with high-tech dives, the real question is whether mining nearby will shake the vents that feed the whole system.

The discovery of the 'Lost City' beneath the ocean surface is a remarkable testament to the ecological richness that lies hidden in our waters. These underwater environments are not just fascinating to explore; they are vital reservoirs of biodiversity that play a crucial role in maintaining the health of our planet. As we delve deeper into these mysteries, it is imperative to recognize the importance of protecting these delicate ecosystems.

Advanced research methods have been key to unveiling the secrets of this bizarre underwater world. By leveraging cutting-edge technology, scientists are not only enhancing our understanding of these unique habitats but also taking steps to ensure their preservation. The commitment to conservation in tandem with exploration is essential, as it allows us to appreciate the wonders of the 'Lost City' while safeguarding its future for generations to come.

Poseidon might be standing tall, but the ocean around it could be the thing that decides its fate.

Want more “how is this real?” moments, see photos of ocean discoveries from parts of the sea rarely reached.

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