Black Box Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

Black Box Plot Summary and Synopsis

Matthieu is a young and talented black box analyst on a mission to solve the reason behind the deadly crash of a brand new aircraft. Yet, when the case is closed by authorities, Matthieu cannot help but sense there is something wrong with the evidence. As he listens to the tracks again, he starts detecting some seriously disturbing details. Could the tape have been modified? Going against his boss’ orders, Matthieu begins his own rogue investigation — an obsessional and dangerous quest for truth that will quickly threaten far more than his career…

Source: Wikipedia (CC BY-SA 3.0).