When the twin towers fell, hundreds of thousands of people fled to the water's edge, only to realize they were trapped on Manhattan, an island. Spontaneously, an armada of boats organized and, without formal planning, pulled off a massive sea evacuation, the largest in history.
Boatlift
The daring 9/11 boatlift, which successfully evacuated nearly half a million people from the devastated piers and seawalls of Lower Manhattan.