Whether rising seas played a role in the collapse of the doomed Surfside condominium is unclear—and perhaps, unlikely—but the new research from Florida International University provides the data for what regular passersby have witnessed in the now-empty parking garage floor: Water rises and falls not just with rain but with the tides. It's made the site of the tragedy a curious little observation tank, a window to watch how groundwater levels shift up and down at the site, and likely along the entire barrier island.