Stairwell: Trapped in the World Trade Center (2002)
Stairwell: Trapped in the World Trade Center is a 9/11 dramatization dealing with a group of people trapped in a sub-basement of the World Trade Center in New York City after the two towers collapse. Stairwell: Trapped In The World Trade Center was written, produced and directed by New York City filmmaker Jonathan M. Parisen. The film premiered in New York City on September 30, 2002 at Anthology Film Archives. [http://imdb.com/title/tt0316669/releaseinfo]
More at Wikipedia.