In a groundbreaking marine discovery, researchers have captured the first ever video evidence of a shark swimming in the frigid waters of the Antarctic Ocean. The unexpected sighting challenges long-standing scientific assumptions about shark habitats in the planet's coldest regions.
An Unexpected Visitor in the Deep
The remarkable footage was recorded in January 2025 by a camera operated by the Minderoo-UWA Deep-Sea Research Centre. Positioned off the South Shetland Islands near the Antarctic Peninsula, the camera captured a substantial sleeper shark estimated to be between 3 and 4 meters (10 to 13 feet) in length.
"We went down there not expecting to see sharks because there's a general rule of thumb that you don't get sharks in Antarctica," said researcher Alan Jamieson, founding director of the University of Western Australia-based research centre. "And it's not even a little one either. It's a hunk of a shark. These things are tanks."
Challenging Scientific Assumptions
For years, marine experts had believed sharks couldn't survive in Antarctica's extreme conditions. The shark was filmed at a depth of 490 meters (1,608 feet) where water temperatures hovered near freezing at just 1.27 degrees Celsius (34.29 degrees Fahrenheit).
Jamieson confirmed he could find no previous record of any shark documented in the Antarctic Ocean, a region defined as below the 60-degree south latitude line. Independent conservation biologist Peter Kyne from Charles Darwin University supported this assessment, stating no shark had ever been recorded so far south before.
Environmental Factors at Play
The discovery raises important questions about marine life distribution in changing ocean environments. Kyne suggested that climate change and warming oceans could potentially be driving sharks toward the Southern Hemisphere's colder waters, though limited data exists about range changes near Antarctica due to the region's extreme remoteness.
Alternatively, the slow-moving sleeper sharks might have long inhabited Antarctic waters without human detection. "This is great. The shark was in the right place, the camera was in the right place and they got this great footage," Kyne remarked. "It's quite significant."
Unique Ocean Conditions
The Antarctic Ocean presents particularly challenging conditions for marine research. Jamieson explained that the photographed shark was maintaining a depth of around 500 meters (1,640 feet) along a seabed sloping into deeper water. This specific depth represented the warmest layer within heavily stratified waters that extend to approximately 1,000 meters (3,280 feet).
"The Antarctic Ocean is heavily layered, or stratified, because of conflicting properties including colder, denser water from below not readily mixing with fresh water running off melting ice from above," Jamieson detailed.
Research Limitations and Future Discoveries
The discovery highlights significant gaps in our understanding of Antarctic marine ecosystems. Research cameras can only operate during the Southern Hemisphere summer months from December through February, leaving approximately 75% of the year without observation.
"The other 75% of the year, no one's looking at all. And so this is why, I think, we occasionally come across these surprises," Jamieson noted.
Few research cameras are positioned at the specific depth where the shark was found, and Jamieson believes other Antarctic sharks likely inhabit similar depths, feeding on whale carcasses, giant squids, and other marine creatures that sink to the ocean floor.
The sleeper shark population in the Antarctic Ocean is likely sparse and difficult for humans to detect, making this accidental discovery particularly valuable for marine science. The research centre granted The Associated Press permission to publish the images, bringing this remarkable finding to global attention.
