Ninety percent of marine species remain unknown to science
In 2025, a global coalition of nearly a thousand scientists set out across the world's oceans and returned with proof that our own planet remains profoundly unknown to us — cataloging 1,121 species never before recorded, from carnivorous sponges in the abyss to ancient ghost sharks off Australia. The Ocean Census, born from a partnership between the Nippon Foundation and Nekton, accelerated the pace of marine discovery by fifty-four percent in a single year, a quiet urgency driven by the knowledge that ninety percent of ocean life has yet to be named. We map distant stars with greater confidence than we map the trenches beneath our own waves, and some of what lives there may vanish before we ever learn its name.
- With only five percent of the deep ocean ever explored, scientists are racing to document life in the abyss before warming waters and human activity erase it entirely.
- Thirteen expeditions in 2025 descended past six thousand meters into lightless, crushing depths — and found not emptiness, but alien abundance.
- Among the most unsettling finds: a carnivorous sponge covered in microscopic hooks to snare crustaceans, already nicknamed the 'death ball,' and a ghost shark from a lineage four hundred million years old.
- A ribbon worm discovered off the island of Timor is now being studied as a possible source of treatments for Alzheimer's disease and schizophrenia, suggesting the deep sea may be as much pharmacy as frontier.
- The 54% surge in annual species identification marks real momentum, but scientists warn that the window to know these creatures — before they disappear — is narrowing faster than the expeditions can move.
In a single year, researchers working under the Ocean Census banner identified more than eleven hundred species never before cataloged. The organization — a collaboration between the Nippon Foundation and Nekton, drawing nearly a thousand scientists from eighty-five countries — conducted thirteen expeditions across the world's oceans in 2025, publishing findings in mid-May that showed a fifty-four percent jump in the annual rate of marine identification.
The deep ocean remains almost entirely unknown. Only about a quarter of the seafloor has been mapped, and barely five percent has been explored. We have better maps of the moon than of our own ocean trenches. Scientists estimate that ninety percent of all marine species have never been identified — a gap made more urgent each year as warming waters and human activity erode the ecosystems that shelter these creatures. Some may vanish before we know they exist.
The expeditions reached into the abyss. A small flowering plant was found growing in what researchers called a 'crystal castle' on a volcanic seamount off Japan — a symbiosis with a glass sponge whose skeleton is made of crystalline silica. Near Australia, at eight hundred fifty meters down, scientists encountered a ghost shark, a chimera from a lineage that diverged from sharks and rays four hundred million years ago. Off the South Sandwich Islands, at thirty-six hundred meters, they found a carnivorous sponge covered in transparent spheres studded with microscopic hooks for snaring crustaceans — named, with some dark affection, the 'death ball.'
Beyond wonder lies utility. A ribbon worm found off Timor produces toxins now being investigated as potential treatments for Alzheimer's disease and schizophrenia. The deep ocean is not merely a frontier of knowledge — it may be a library of solutions to problems medicine has not yet solved.
The work of Ocean Census frames a quiet paradox: we live on a water world and understand it less than we understand distant stars. Each species named, each genome recorded, is a small victory against the possibility that these creatures will disappear before we ever truly knew them.
In the span of a single year, researchers working under the Ocean Census banner identified more than eleven hundred species that had never been cataloged before. The organization, a collaboration between the Nippon Foundation and Nekton that assembled roughly a thousand scientists from eighty-five countries, conducted thirteen separate expeditions across the world's oceans in 2025. When they published their findings in mid-May, the numbers were striking: 1,121 new species, a fifty-four percent jump in the annual rate of marine identification.
The deep ocean remains almost entirely unknown to us. Only about a quarter of the seafloor has been mapped. Barely five percent has actually been explored. By comparison, we have better maps of the moon than we do of the trenches beneath our own waves. Scientists estimate that ninety percent of all marine species have never been identified, let alone studied. This gap in knowledge grows more urgent each year as warming waters, pollution, and human activity erode the ecosystems that harbor these creatures. Some species may vanish before we even know they existed.
The expeditions reached into the abyss. Some discoveries came from depths exceeding six thousand meters—places where sunlight has never penetrated, where pressure would crush most surface life instantly. Yet life thrives there, often in forms that seem almost alien. A small flowering plant called Dalhousiella yabukii was found on a volcanic seamount off Japan's coast, growing in what researchers describe as a "crystal castle"—a symbiotic relationship with a glass sponge whose skeleton is made of crystalline silica. Near Australia, at eight hundred fifty meters down, scientists found a ghost shark, a chimera, a creature that belongs to a lineage that split from sharks and rays four hundred million years ago, before dinosaurs walked the earth.
Other discoveries were stranger still. Off the South Sandwich Islands, at depths of thirty-six hundred meters, researchers identified a carnivorous sponge unlike anything previously documented. It is covered in tiny transparent spheres studded with microscopic hooks designed to snare crustaceans. The scientists named it the "death ball." These are not creatures of myth or speculation. They are real animals, cataloged and preserved, their existence now part of the scientific record.
Beyond the sheer wonder of these discoveries lies a practical dimension. Some of these organisms may hold keys to treating human disease. A ribbon worm found in Timor, an island in Southeast Asia, produces toxins that researchers are now investigating as potential treatments for Alzheimer's disease and schizophrenia. The deep ocean, in other words, is not merely a frontier of knowledge—it is a potential pharmacy, a library of solutions to problems we have not yet solved.
The work of Ocean Census underscores a paradox at the heart of modern science: we live on a water world, yet we understand our own planet less well than we understand distant stars. The organization's expeditions in 2025 represent a race against time. Each species identified, each genome sequenced, each behavior documented is a small victory against the possibility that these creatures will disappear before we ever truly knew them. The ocean's depths are not empty. They are full of life, full of possibility, and full of mysteries we are only beginning to uncover.
Citas Notables
Ocean Census researchers identified a carnivorous sponge off the South Sandwich Islands and nicknamed it the 'death ball' for its appearance and predatory design— Ocean Census expedition findings
Toxins from a ribbon worm discovered in Timor are being studied as potential treatments for Alzheimer's disease and schizophrenia— Ocean Census research report
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that we find these species now, rather than later?
Because the ocean is changing faster than we can study it. Warming, acidification, pollution—these are all accelerating. A species might go extinct before we even know it existed. Once it's gone, we lose not just the organism but everything it could teach us.
You mentioned the ribbon worm and Alzheimer's. How often does that actually happen—a deep-sea creature yielding a medical breakthrough?
It's rare enough that we can't count on it, but common enough that we'd be foolish to ignore it. The ocean is a vast library of chemical compounds we've never tested. We don't know what we're throwing away when we let ecosystems collapse.
The numbers are striking—1,121 species in one year. Does that mean we're finally catching up to the unknown?
Not really. That's a fifty-four percent increase in the annual rate, which sounds dramatic, but we're still cataloging maybe one percent of what's out there. We're moving faster, but the ocean is incomprehensibly large.
What struck you most about the specific discoveries—the death ball, the ghost shark, the crystal castle plant?
That they exist at all. We think of the deep ocean as barren, but it's teeming with life that has evolved in complete isolation from the surface world. These creatures have solved problems we didn't even know existed. That's humbling.
What happens to these species once they're discovered and named?
Some go into museums, some into genetic databases. But most remain almost unknown. We've identified them, but we haven't really studied them. That's the next frontier—understanding not just that they exist, but how they live, what they eat, how they reproduce.