MELBOURNE, Australia — In an astonishing discovery, researchers have filmed a sleeper shark navigating through the icy depths of Antarctica, a sight previously thought impossible due to the region’s extreme environment. The footage captured in January has prompted a reevaluation of what types of marine life can be found in such frigid waters.

The shark, measuring between 3 and 4 meters (10 to 13 feet), was filmed by a camera deployed by the Minderoo-UWA Deep-Sea Research Centre, located off the South Shetland Islands close to the Antarctic Peninsula. This area, designated as part of the Antarctic Ocean, lies below the 60-degree south latitude line, a region typically thought inhospitable to sharks.

Alan Jamieson, the founding director of the research center, expressed his surprise at the sighting. “We went down there not expecting to see sharks because the prevailing notion is that they don’t inhabit Antarctic regions,” he noted. He described the shark as a formidable presence, likening its bulk to that of a tank.

The shark was located at a depth of 490 meters (1,608 feet), where water temperatures hovered just above freezing at 1.27 degrees Celsius (34.29 degrees Fahrenheit). In the footage, a skate—another relative of the shark seen motionless on the seabed—highlighted the ecological dynamics of the area. Unlike the sleeper shark, skates have previously been confirmed to inhabit these southern waters.

Jamieson reported that there were no documented sightings of sharks in the Antarctic Ocean, aligning with the views of Peter Kyne, a conservation biologist at Charles Darwin University. “This finding challenges previous assumptions about shark distribution in the region,” Kyne commented, emphasizing its significance.

Experts speculate that shifting ocean temperatures due to climate change might be encouraging sharks to venture into colder waters. However, limited research in this remote part of the world means data on marine species in Antarctica is scarce. Kyne suggested that these sleeper sharks may have been lurking in the depths all along, unnoticed until now. “This is great,” he remarked. “The right place, the right camera, and we got this incredible footage.”

Jamieson emphasized the challenges of studying marine life at such depths, noting that the underwater environment is stratified. The 500-meter depth where the shark was located is considered to be the warmest layer amid multiple water layers that do not readily mix due to temperature and density discrepancies. He anticipates that other species of sharks might be living at similar depths, feasting on the remains of larger marine creatures that sink to the ocean floor.

Unfortunately, there are few cameras positioned to monitor a depth of this magnitude in Antarctic waters, and those that do exist operate only during the summer months from December to February. “For the other 75% of the year, there’s no observation at all,” he explained. This lack of research may explain why surprising discoveries like this one happen infrequently.

The sighting serves as a reminder of the unexplored mysteries beneath the Antarctic Ocean and raises questions about the future of marine life in the face of climate change. With increasing interest in deep-sea biodiversity, researchers hope to uncover more about these elusive species in years to come.