Just after 1 a.m. Thursday, a sudden, unexpected, and devastating structural failure occurred in Surfside, Florida, when a large section of a 12-story condominium building collapsed. A short distance from the shore north of Miami Beach, the Champlain Towers South Condo’s southeast corner simply fell, bringing 55 of the building’s 136 units to the ground in seconds. Security camera footage from a nearby building shows the structure falling straight down, in two separate chunks, as if the ground underneath had slipped away.

+INFO: Fast Company