ATLANTA — Federal officials announced Friday that they detained 475 people at a construction site on the Hyundai Metaplant campus near Savannah during a Thursday operation, the largest single immigration raid in the history of Homeland Security Investigations.

Steven Schrank, special agent in charge of HSI Atlanta, said the arrests stemmed from a monthslong investigation into alleged undocumented and illegal work at a battery plant under construction in Bryan County. The battery factory is part of Hyundai Motor Group’s 3,000-acre Metaplant site, a $12.6 billion project, including the battery facility, that has been touted by Georgia leaders as the largest economic development deal in state history.

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