Zombies in New York

It was a crazy idea.
There was almost no chance it would work, but they were trapped.
The bridges were blocked with wrecked vehicles and zombies. The tunnels and subways were packed with zombies. The harbors were full of zombies. There was no other way out of the city. Zombies were everywhere and they were getting hungrier. It was the only thing they could do.
The military was coming with bombs and they had to warn them.
Then the nightmare became even worse.