Thirteen minutes of tape were preserved; the rest was burned. The tape ends four minutes after the shuttle's atmospheric entry, while the shuttle is still over the Pacific and flying normally....The board knew about the videotape for the past several days but did not discuss it at its weekly news conference Tuesday afternoon, the official said, because it wanted to give NASA time to show it to the astronauts' families
This is exactly the kind of thing that gets conspiracy theorists going. And I can't blame them.