Past Insight on Instagram: "(Follow) us @past.insight After the South Tower collapsed at 9:59 a.m., firefighters and civilians near the World Trade Center were still evacuating when the North Tower fell at 10:28 a.m. From street level, the collapse was experienced as overwhelming and sudden. Survivors described a deafening roar, violent shaking, and a massive cloud of dust as floor after floor gave way in rapid succession. For those on the ground, the event was not understood as a structural fai