Full Breakdown
Unmanned Submarine Ran Discovers Hidden Structures Beneath Antarctica's Dotson Ice Shelf
4/17/2026, 11:30:21 AM
Discovery of Under-Ice Structures
An unmanned submarine, known as Ran, has uncovered previously unknown structures beneath Antarctica's Dotson Ice Shelf. The autonomous underwater vehicle, operated by a team led by Anna Wåhlin from the University of Gothenburg, was on a mission to map the ice shelf's underside when it traveled approximately ten miles into the ice and subsequently went silent. Over the course of its mission, Ran mapped 54 square miles of the ice's underside, revealing complex formations such as flat plateaus, terraced steps, and teardrop-shaped pits, which had not been detected in satellite images.
Mapping and Observations
Ran's sonar mapping indicated that the ice shelf's eastern side is thick and slow-melting, while the western side is thinner and experiences rapid melting. The submarine's findings suggest that warm water from the Circumpolar Deep Water current is primarily responsible for the erosion of the western side, where melt channels are losing ice at a rate of approximately 40 feet per year. The data collected indicates that the Dotson Ice Shelf contributed about 0.02 inches to global sea level rise between 1979 and 2017.
The submarine also documented full-thickness fractures that have been present since the 1990s, which have been widened and smoothed by melting. These fractures allow warmer water to flow against the ice, accelerating the melting process. The findings challenge existing computer models that often overlook the role of these fractures in directing warm water and concentrating ice loss.
Implications for Sea Level Rise
The implications of Ran's discoveries are significant for understanding future sea level rise. Since 1979, Antarctic ice loss has contributed approximately 0.55 inches to global sea levels, with much of this loss occurring in West Antarctica. The thinning or collapse of ice shelves like Dotson can lead to accelerated glacier movement and increased sea levels. The detailed maps produced by Ran are expected to enhance predictions regarding the rate of ice loss in a warming climate.
The Disappearance of Ran
During a subsequent mission to extend its mapping efforts, Ran disappeared after failing to resurface at the designated pickup point. Attempts to re-establish contact with the vehicle were unsuccessful, leading to speculation about potential causes, including mechanical failure or a collision with ice ridges. Wåhlin expressed concern about the vehicle's disappearance, noting the daunting nature of sending Ran into the unknown depths without real-time communication.
Conclusion and Future Research
Despite the loss of Ran, the data collected during its missions has transformed researchers' understanding of the interactions between ice and ocean currents in the Dotson Ice Shelf area. The findings highlight the complexity of the melt processes and underscore the need for further exploration of Antarctica's hidden melt dynamics. The study detailing these discoveries has been published in *Science Advances*, emphasizing the importance of continued research in this critical region.
