wtc on Instagram: "WTC 9/11 Footage filmed by WABC-TV "NewsCopter 7" and showing the total collapse of the 2 World Trade Center. The South Tower of the World Trade Center collapsed at 9:59 a.m. on September 11, 2001. The collapse took approximately 10 seconds. The tower had been burning for 56 minutes after being struck by United Airlines Flight 175. #neverforget"

wtc on Instagram: "Evan Fairbanks' 9/11 footage, taken from Church Street, shows the collapse of the South Tower on the morning of September 11, 2001. The beginning of the video is in slow motion. After burning for 56 minutes, the South Tower collapsed in 10 to 13 seconds at 9:59 a.m. Shock waves from the collapse were so strong, seismic recording devices at Columbia University's observation station 21 miles north of the World Trade Center logged a spike of earthquake-level activity measuring 2.