A Surprise in the Darkness (Image Credits: Pixabay)
South Shetland Islands – Researchers captured the first-ever video of a sleeper shark in the Antarctic Ocean, challenging assumptions about marine life in one of Earth’s harshest environments.[1][2]
A Surprise in the Darkness
The footage emerged from a baited camera deployed in January 2025 at a depth of 490 meters, or about 1,600 feet, off the South Shetland Islands near the Antarctic Peninsula.[1] Water temperatures hovered at a chilling 1.27 degrees Celsius, just above freezing.[1] The shark, estimated at three to four meters long, cruised slowly across the barren seabed before vanishing into the gloom.
Alan Jamieson, founding director of the Minderoo-UWA Deep-Sea Research Centre, described the moment. “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,” he said.[1] The team reviewed hours of video and spotted the unexpected visitor, marking the first recorded shark in these waters.
Traits of the Enigmatic Sleeper Shark
Sleeper sharks belong to the family Somniosidae, known for their robust builds, mottled skin, and deliberate movements.[3] Often called “tanks” for their hefty frames, these predators thrive in deep, cold environments worldwide.
This specimen likely represented the Southern sleeper shark, Somniosus antarcticus, the most southerly shark species known.[3] First sketched in 1913 from a washed-up specimen near Macquarie Island, the species remained elusive, with prior knowledge limited to rare bycatch.
- Large-bodied with small fins for deep-sea navigation.
- Slow swimmers, contrasting faster relatives like makos.
- Northern cousins, such as Greenland sharks, boast lifespans exceeding 500 years.
- Diet includes scavenging whale carcasses and giant squid.
- Adapted to extreme pressures and low oxygen levels.
Why Sharks Shunned Antarctica
Experts long assumed the Antarctic Ocean lacked sharks due to its punishing cold and isolation.[2] Native fish evolved antifreeze proteins to survive sub-zero conditions, but cartilaginous sharks faced different physiological hurdles.[3]
Only five shark species appeared in records around Antarctica, mostly from sub-Antarctic fisheries.[3] Powerful currents, prolonged darkness, and scarce prey further deterred them. Yet this footage proves otherwise, highlighting vast knowledge gaps in the remote Southern Ocean.
Jessica Kolbusz, the oceanographer who first noticed the shark, called it surprising as the initial in-situ elasmobranch recording there.[3]
Broader Implications for Polar Seas
The discovery underscores the need for more deep-sea exploration in polar regions. Cameras operate seasonally during the Southern Hemisphere summer, leaving much unseen.[1] Climate change warms these waters, potentially shifting shark ranges southward and altering ecosystems.
Conservation biologist Peter Kyne praised the footage: “The shark was in the right place, the camera was in the right place and they got this great footage. It’s quite significant.”[1] Increased shark presence could pressure fish stocks, rippling through krill-dependent food webs that sustain whales, seals, and penguins.
Key Takeaways
- First video evidence of a shark in the Antarctic Ocean at 490 meters deep.
- Challenges beliefs about shark absence in frigid polar waters.
- Highlights urgency of deep-sea research amid climate shifts.
This sleeper shark sighting opens a window into Antarctica’s hidden biodiversity. As oceans change, such revelations remind us how little we know of the deep. What surprises might the next deployment uncover? Share your thoughts in the comments.
