Watch TV Series NYC Epicenters 9/11 to 2021 1/2 HBO Documentary Series Online Free. NYC Epicenters 9/11→2021½ is an epic chronicle of life, loss and survival in the city of New York over the twenty years since the September 11th attacks. The multi-part documentary event will offer an unprecedented, sweeping portrait of New Yorkers as they rebuild and rebound, from a devastating terrorist attack through the ongoing global pandemic.