13 Impacting Images and Facts to Remember the Tragedy of September 11

September 11, 2001. Eighteen years ago one of the greatest tragedies in the United States was happening: the attack on the Twin Towers. In all, about 3, 000 people died when 19 al-Qaeda terrorists hijacked four planes and launched two of them on the south and north towers of the World Trade Center and one on the Pentagon. The fourth plane crashed in Shanksville, Pennsylvania, killing everyone on board.

1. The World Trade Center consisted of a seven-tower complex spanning 64, 750 square meters

2. More than 400 companies from 25 different countries had offices on site. The number of people working on the affected towers was 50, 000.

3. To get a sense of the size of the complex, 50 tons of waste were generated daily and 8.5 million liters of drinking water consumed.

4. Prior to September 11, the World Trade Center suffered a fire on February 13, 1975 and a bomb attack on February 26, 1993.

5. It is estimated that 353 people who were trapped in the towers during the bombings were able to communicate, even sending farewell messages.

6. A man on the bombing's missing list was found alive a year later. George Sims, 46, was suffering from amnesia and schizophrenia.

7. More than 3, 000 children were orphaned by a parent.

8. Even with the force of impact, the collapse of the towers corresponds to 1% of the explosion of an atomic bomb.

9. Pieces of the victims' bodies were found five blocks away.

10. It is estimated that the terrorists collided with the buildings at a speed of 450 km / h, almost half the capacity of the plane. The explanation? Above 800 km / h the aircraft would push so much air in front of it that it would not be possible to continue the course in a straight line. Therefore, in addition to the reduced speed, they made a curved path to reach the towers.

11. Upon impact, each floor reached reached a temperature of 1, 000 degrees Celsius.

12. Cantor Fitzgerald LP investment bank had offices on the 101st and 105th floors, losing 658 of its 960 employees.

13. It is estimated that at least 200 people have jumped from the buildings due to strong heat and smoke. Among them Jonathan Briley, which appears in the photo below. He was known for this record by photographer Richard Drew, later called The Falling Man.