Ryder Williams, 16, sprang into the water at Seabright Beach in Santa Cruz on Saturday after he spotted Nathaniel Rai, 10, struggling to stay above the dangerous surf.

A terrifying video shows a rescue at a Santa Cruz beach when a child was swept into powerful waves, prompting a 16-year-old lifeguard to save the child’s life.

A boy was rescued by lifeguards Saturday at a Santa Cruz beach in California as large swells contributed to at least 25 rescues across Santa Cruz County. The rescue at Seabright…