A small, unmanned boat has set off on a long journey around Antarctica, with no expected return for several months. The vessel, about seven meters long and resembling a large orange kayak, is designed to travel approximately 22,000 kilometers through some of the most extreme waters on Earth. This distance is seven times the distance between Sydney and Perth. Along the way, it will face massive waves, freezing temperatures, strong winds, and even encounters with curious wildlife like seals and albatrosses. The mission aims to collect data on carbon dioxide levels in both the ocean and atmosphere, which will help scientists better understand how the oceans help regulate global temperatures. Dr. Elizabeth Shadwick, a research scientist at Australia’s CSIRO, explained that the vessel left from Hobart and will travel east toward New Zealand, eventually passing through the Drake Passage, a notoriously rough stretch of water between South America and Antarctica. It will then continue along the southern coast of Africa before returning to Hobart, where it will be retrieved in seven to nine months. The boat, built by the American company Saildrone, is equipped with a heavy keel for stability, a rudder for steering, and a solar panel on top to power its systems. It is monitored remotely by the company, which can adjust its course via satellite if needed. “It’s already been through some tough conditions,” Shadwick said, noting it faced waves up to eight meters high and winds of 35 knots shortly after deployment. Throughout its journey, the boat will collect a wide range of data, including wind speed, atmospheric pressure, solar radiation, ocean temperature, salinity, chlorophyll levels, and carbon dioxide in both the air and water. These measurements are crucial for understanding how the oceans help mitigate global heating. “The ocean is doing all of us a great service by absorbing about a third of human emissions every year,” Shadwick said, highlighting the Southern Ocean’s important role. Understanding how this natural process might change in the future is essential if we are to continue relying on the ocean as a carbon sink. This autonomous vessel is the first in a planned fleet of four, with others set to be launched every three months. They will be deployed across the Southern, Pacific, Atlantic, and Indian Oceans, particularly during winter, when data collection is more challenging. Scientists will access the data in near real time through a dedicated mission portal. Once the vessels return, all the collected information will be reviewed for accuracy before being shared for further research. Dr. Pep Canadell, another CSIRO scientist, emphasized that the ocean and forests absorb about half of the carbon dioxide emitted from burning fossil fuels, effectively reducing the impact of climate change. However, this natural absorption could be affected by factors like warming oceans, changing wind patterns, melting ice, and ocean acidification. Monitoring these changes is key to understanding how the climate system might evolve.