A team of marine biologists was taken by surprise when a deep-sea camera, deployed near the South Shetland Islands, captured footage of a sleeper shark in Antarctic waters--an area where such species were not anticipated. The recording occurred in January 2025, showcasing the shark gliding gracefully across a sunless seabed.
Operated by the Minderoo-UWA Deep-Sea Research Centre, the camera was positioned in the Southern Ocean, close to the Antarctic Peninsula. This unexpected sighting challenges long-held assumptions in marine science that sharks do not inhabit Antarctic regions.
Alan Jamieson, the center's founding director, noted that the research team did not expect to encounter sharks during their expedition. "We approached this mission with the understanding that sharks are generally absent from Antarctica," he remarked. "What we encountered was not a small specimen; it was a substantial shark, robust in size."
The shark, estimated to measure between 10 to 13 feet (3 to 4 meters), was filmed at a depth of 1,608 feet (490 meters), where the water temperature hovered just above freezing at approximately 34°F (1.27 degrees Celsius). This observation suggests that the shark was well adapted to the frigid conditions.
Interestingly, the footage also captured a skate, a close relative of sharks, resting on the ocean floor, seemingly unfazed by the passing predator. While the presence of skates in such southern waters did not surprise scientists, the sighting of the sleeper shark certainly did.
Jamieson expressed that there has been no prior documentation of sharks at such depths in Antarctic waters. This raises the question: Is this a sign of ecological change, or does it highlight the limited exploration of these remote areas?
One hypothesis points to the warming of ocean waters, potentially driving some species to explore colder regions. Peter Kyne, a conservation biologist from Charles Darwin University, suggested that climate change may influence marine life distribution. However, he also emphasized the challenge of gathering data in such hard-to-reach locations, which may mean that scientists are missing vital information about these ecosystems.
Alternatively, it is possible that sleeper sharks have always existed in these waters, remaining unnoticed due to their slow movement and the depth at which they reside. Antarctica's mid-depth zones still contain many unexplored areas, leaving room for surprises like this one.
Jamieson noted that the shark's depth of around 1,600 feet is significant, as it allows for a unique thermal layer where conditions may be less extreme, thus providing a more favorable habitat for large predators.
This discovery underscores the importance of continuous monitoring in Antarctic waters, especially considering that very few research instruments operate at such depths outside the Southern Hemisphere summer months. "For the majority of the year, we lack observational data," Jamieson pointed out, highlighting the potential for further unexpected finds in the future.