Far beneath drifting sea ice, where light fades and pressure crushes, one research camera recently caught something no one expected.
In the freezing darkness off Antarctica, a slow-moving giant has surprised a team of deep-sea scientists and quietly rewritten what we thought we knew about life at the bottom of the planet.
A ghost in the dark: the moment the shark appeared
The footage comes from a 2025 expedition near the South Shetland Islands, about 120 kilometres north of the Antarctic Peninsula. Researchers from the Minderoo-UWA Deep Sea Research Centre and Inkfish Expeditions had lowered a baited camera system to around 490 metres, hoping to catalogue the region’s hidden wildlife.
For days, nothing dramatic happened. The cameras rolled in near-freezing water, capturing the slow ballet of invertebrates and a few cautious fish. More than 400 hours of video accumulated before the unexpected visitor finally slid into view.
A large shark emerged from the darkness, gliding through 2 °C water in front of the bait, delivering the first filmed evidence of a shark in Antarctic waters.
The animal moved in a measured, almost sluggish way, yet its size and presence dominated the frame. For expedition lead Alan Jamieson, this was not just a lucky shot, but a moment that instantly stood out as a scientific milestone.
A sleeper shark in the Antarctic deep
From its bulky body, broad head and unhurried style of swimming, specialists quickly recognised the visitor as a sleeper shark, a member of the Somniosidae family. Early analysis suggests it is likely a southern sleeper shark (Somniosus antarcticus), a species usually associated with cold, deep waters of the Southern Hemisphere, but never before recorded this far south on camera.
Sleeper sharks are famous for their slow metabolism, mysterious habits and, in some related species, astonishing lifespans that may reach several centuries. They tend to cruise at depth, conserving energy in water that hovers just above freezing.
The sighting hints that large, long-lived predators may have been patrolling Antarctic depths for generations, invisible to science until now.
A taxonomic puzzle that goes back a century
This single shark does more than add a dot on a map. It feeds directly into a long-running scientific debate. Researchers still struggle to pin down exactly how many species of sleeper shark exist. Morphological differences are subtle, and modern genetic samples are rare.
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The Antarctic footage, paired with any tissue or environmental DNA that can be collected in future trips, could help clarify where the southern sleeper shark sits within the group. For taxonomists, that means revisiting almost a century of scattered records and sometimes contradictory descriptions.
How the team captured the first Antarctic shark on film
The expedition used a simple but tough setup: a steel frame equipped with high-resolution cameras, lights and a bag of bait fixed just in front of the lens. Once dropped to the seabed, the system was left alone while the research vessel moved off, reducing disturbance.
- Depth of deployment: about 490 metres
- Water temperature: roughly 2 °C
- Location: off the South Shetland Islands, Antarctic region
- Recording time: around 400 hours of video analysed
- Main target: inventory of local deep-sea biodiversity
These “landers” have transformed deep-sea biology over the past decade. They are cheaper than crewed submersibles, can be deployed repeatedly and can operate in places where ice and storms make traditional ship-based sampling risky.
A predator hiding in slightly warmer layers
Many Antarctic fish have evolved special adaptations, such as antifreeze-like proteins in their blood, to survive in water that can sit below the normal freezing point of fresh water. The sleeper shark filmed here appears to take a different approach.
Instead of radically changing its blood chemistry, this shark seems to use deep layers that are just a little warmer, staying in narrow temperature bands where it can function without extreme adaptations.
Researchers think the animal is probably not a rare visitor that strayed off course. More likely, sleeper sharks have occupied these waters for a long time, slipping through layers of slightly milder deep water beneath the ice-covered surface.
Why one shark sighting matters for Antarctic science
Antarctic deep seas remain among the least studied regions on Earth. Harsh weather, sea ice and limited ship time mean that scientists have only brief windows each year to work. Large areas of the seafloor have never been filmed at all.
The presence of a big, slow-moving predator suggests a food web that can support such animals year-round. That points to steady supplies of organic matter sinking from surface waters, or possibly to occasional surges of food from seasonal blooms of plankton and krill.
| Question | What this sighting suggests |
|---|---|
| Are Antarctic deep waters lifeless? | No. They can sustain large predators such as sleeper sharks. |
| Are shark ranges fully mapped? | Not yet. Even major species still hold surprises. |
| Is biodiversity stable in the deep? | Likely dynamic, responding to climate and ice changes. |
| Do we know all Antarctic species? | Far from it. Many animals remain undocumented or unnamed. |
This unexpected shark also matters for climate research. As ocean temperatures and ice cover shift, the distribution of cold-water species will change. Tracking where sleeper sharks and other deep predators live can act as an early signal of broader ecosystem shifts in the Southern Ocean.
What exactly is a sleeper shark?
The term “sleeper shark” describes a family of sharks that share a set of traits:
- They move slowly and conserve energy.
- They live mainly in deep, cold water.
- They often reach impressive sizes, sometimes over six metres.
- They feed on fish, squid and occasionally carcasses that sink from the surface.
The Greenland shark, a close relative, has been dated at more than 250 years old using radiocarbon techniques on eye tissue, sparking headlines about “400-year-old sharks”. If southern sleeper sharks age at a similar pace, some individuals in Antarctic waters could have been alive since before modern Antarctic science even began.
Key terms worth unpacking
Several scientific words linked to this story often appear in discussions of Antarctic ecosystems:
- Biodiversity refers to the variety of life in a given area—different species, their genes and the ecosystems they form.
- A peninsula is a piece of land that juts out into the sea and is surrounded by water on most sides, like the Antarctic Peninsula stretching towards South America.
- An appât, or bait, is the attractant used to lure animals close to the camera for study, often a piece of fish or other meat.
What future research in Antarctic waters could look like
The next logical step is to collect direct samples and longer datasets. That might mean deploying more baited cameras at different depths and locations, or pairing them with acoustic sensors that can pick up shark movements in the dark.
Scientists may also attempt to sample environmental DNA, the traces of genetic material that animals shed into the water through skin cells, slime or waste. Matching that DNA with footage of specific species builds a powerful toolkit for tracking rare creatures without needing to catch them.
Future expeditions could reveal whether this was one solitary giant or a sign of a larger, hidden population of Antarctic sleeper sharks.
For the wider public, this encounter also changes how we picture Antarctica. Most people imagine penguins, seals and whales at the surface. Few imagine a heavy-bodied shark, centuries old, cruising silently in the half-light hundreds of metres below. Climate change, fishing pressure in adjacent regions and growing interest in polar resources all raise questions about how resilient such deep communities will be in the coming decades.
For now, the shark off the South Shetland Islands stands as a reminder that even in 2025, under some of the most studied skies on Earth, the sea beneath still holds surprises large enough to reshape textbooks—caught by a single camera staring patiently into the dark.