The alternate explanation says that the debris being recovered and removed from the site was from a spacecraft piloted by extra-terrestrials. The debris was collected by the U.S. military including the aliens inside the spacecraft. The official statement was made up to cover up the real story. The military conducted various tests both on the flying saucer and the alien remains.
A British man released a stunning video in 1999 showing an alien autopsy. The man claimed that he acquired the footage from the U.S. military source. Few years later, he admitted that the video was made by himself. However, he insisted that the self-made video was a recreation of actual footage of alien autopsy. He said that the original film was destroyed when it exposed to air.