An estimated 3,000 lives were lost in 1928 when a hurricane swept across the southeastern coast of Florida, leading officials to burn remains on pyres and bury them in mass graves to stave off epidemics. At a Port Mayaca, Fla., cemetery, archaeologist Shawn Patch recently used ground-penetrating radar equipment to learn more about a plot that bears a marker for about 1,600 unidentified people.

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