It was just before noon when Nathaniel Woodcock returned to the beach with fresh batteries for his drone. It was the height of the Australian summer, and the 21-year-old was spending another day scanning the emerald waters from above.
He spotted something headed toward the swimmers and surfers: A seven-foot shadow. A great white shark.
Woodcock radioed lifeguards, then activated the warning system, he later recalled, recounting the incident to a reporter. “Attention, beach users,” the drone blared. “There is a shark in your area. Please exit the water.”
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