The second black box recovered from the wreckage of Germanwings flight 4U9525 shows that the co-pilot accelerated the aircraft as it descended into the Alps, French aviation officials said Friday.

French aviation authority BEA also said that the flight data recorder confirms that Andreas Lubitz changed the autopilot to lower the plane to an altitude of 100 feet, a figure that experts have speculated was likely the lowest that it could have been set at.

The changes, which caused the Airbus A320’s demise and killed all 150 people on board, have opened a raft of investigations into the culpability of Lubitz.

According to audio recordings, Lubitz locked the cockpit door and was alone while changing the flight controls. German prosecutors have revealed that Lubitz searched for suicide methods and cockpit locking mechanisms online during the week prior to the fatal crash. News24