Largest sea evacuation 9/11 Facts | 0 comments The largest sea evacuation in the U.S. happened on 9/11. Almost 500,000 people got evacuated by boat in less than 9 hours. Fact source Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed.