This Armada of Saildrones Could Conquer the Ocean

Every spring, thousands of great white sharks begin a mysterious migration. From up and down America’s West Coast, they head straight for a Colorado-size patch of the Pacific about halfway between San Diego and Hawaii. Once there, they hang for months at what marine biologists call the White Shark Cafe, frolicking and diving 1,500 feet or more. For decades, we didn’t know much more about what they do there—or why. This year, we should get some answers, thanks to a pair of saildrones.

Each drone is a 23-foot neon-orange sailboat that catches wind with a solid wing more durable than a cloth sail. As the name implies, they’re seaworthy, autonomous robots, though a human pilot can take control remotely. In mid-March, two saildrones packed with sensors, cameras, and scientific instruments launched from a dock in the Bay Area city of Alameda, gliding past Alcatraz and beneath the Golden Gate Bridge to begin a three-week, 1,200-mile journey to the Shark Cafe.