The chilling last words of the co-captain before a pilot deliberately crashed a plane full of people into a mountain have been revealed.
Andreas Lubitz crashed the Germanwings plane into the Alps in March 2015, killing 150 people.
Black box recordings have revealed his chilling last words and the desperate last words of the co-captain who tried to save his plane.
The plane was heading from Barcelona Airport in Spain to Duesseldorf, Germany and should have been a two-hour flight.
In transcripts obtained by the German press, co-pilot Andreas Lubitz repeatedly tells Captain Patrick Sondeimer that he is ready to take over "any time".
Around 30 minutes after takeoff he eventually says "you can go now" and Sonderheimer told the 28-year-old that he was leaving the cockpit and asked him to take over radio communications.
The captain was likely going to the toilet and the cockpit door is heard opening and closing on the black box recording.
Seconds later, the selected altitude was changed from 38,000ft to 100ft and the plane began to descend rapidly.
French prosecutor Brice Robin said: "This action on the altitude controls can only be deliberate."
Air traffic control contacted the 28-year-old co-pilot, but received no answer.
Knocking and muffled voices asking for the door to be opened can be heard until the end of the recording.
The captain screamed: "For God’s sake, open the door."
He is also heard trying to smash the door down with a metal object and when he yells: "Open the damn door", Lubitz does not reply.
The plane plummeted through the sky in just 10 minutes and Lubitz did not say a single word in that time and his breathing remained normal. This was all while crew members and air traffic control tried to get him to respond.
Emergency codes can allow the crew to enter an aircraft cockpit in the event of an incapacitated pilot.
But in this instance, the co-pilot is thought to have intentionally overridden the system, which is a post-11 September 2001 security measure intended to prevent hijack.
"The kneejerk reaction to the events of 9/11 with the ill-thought reinforced cockpit door has had catastrophic consequences", said Philip Baum, the London-based editor of the trade magazine Aviation Security International.
During the very last moment of the recording, passengers can chillingly be heard screaming.
The plane hit the mountain at 430mph an hour and Robin said death would have been instant.
Family of those who died took comfort in knowing that they would not have realised what was happening until seconds before their death.
Among the 150 passengers and crew who died were babies, exchange students, two opera singers, football reporters and a Pentagon contractor.
One British woman, Marina Bandres Lopez-Belio and her seven-month-old son Julian Pracz-Bandres died on the flight. Leaving her husband a widow.
While two British men, 28-year-old Paul Andrew Bramley and 50-year-old Martyn Matthews also died.
The captain was married with two small children.
In a sick twist, the murderer had hidden a sick note declaring him unfit to work on the day of the disaster.
And according to the German newspaper Bild, a former girlfriend of Lubitz said he had told her last year: "One day I will do something that will change the whole system, and then all will know my name and remember it."
She added: “I never knew what he meant, but now it makes sense.”
Lubitz had spent 18 months receiving psychiatric treatment and he was forced to repeat his flying classes several times because of depression before he successfully finished his training.
In 2009 he was diagnosed with a “severe depressive episode”, Bild reported.
