From the BBC’s “The Conspiracy Files”:
Q&A: What really happened
Did United 93 crash?
Photographs taken at the crash site near Shanksville show a small crater and fragments of clearly identifiable aircraft wreckage along with personal possessions from some of those on board.
But the size of the crater and the absence of large pieces of wreckage have led some to question whether UA93 actually crashed there at all. This question is examined at the following website: