AHMEDABAD, India (AP) — Indian investigators on Friday recovered the digital flight data recorder, or the black box, of the Air India flight that fell from the sky and killed 241 people on board and several people on the ground, authorities said.

There have been cases of a very small number of survivors in very serious accidents, but it is "very rare" for there to be only one, a professor told Newsweek.

The sole survivor of the Air India plane crash said that he climbed out of a broken emergency exit after the aircraft hit a medical college hostel in the city of Ahmedabad, killing more than 240 people.