Federal investigators said this week that the 2021 collapse of the Surfside, Florida, condo building that killed dozens of people stemmed from a structural failure in the pool deck, not the tower itself. The finding is in a study from the National Institute of Standards and Technology on the partial collapse of Champlain Towers South. Ninety-eight people were killed when the building fell on early June 24, 2021. The agency said it used "large-scale structural testing and computer analyses" of vi