New York was a city of 8 million people in 2001. A city that would be changed forever by the events of 9/11.

In this episode, we will not recount the day itself. Instead, we're looking at the after effects of the attack on New York city. What dangers remained after the buildings collapsed? How did it alter the communities of Manhattan? And how did the city decide how to fill the spaces left behind?

Don speaks to Susan Opotow and Zachary Baron Shemtob, authors of 'New York after 9/11' about the impact of toxic gases, conflicting planning and increased surveillance on this iconic city.

Produced and edited by Sophie Gee. Senior Producer was Charlotte Long.

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