The car in which Princess Diana died has been shipped to London for forensic examination by the Metropolitan Police.
Princess Diana and Dodi Al Fayed died on 31 August 1997
Investigators will comb the wrecked Mercedes for clues to the cause of the crash that killed her, her lover Dodi Al Fayed and chauffeur Henri Paul.
The evidence, gathered using state-of-the-art technology, will be used to create a three-dimensional computer model of the crash scene.
It will form an important part of the Met's probe into the 1997 Paris crash.
Inquests into the deaths of the princess and Al Fayed opened 18 months ago, but were adjourned for the lengthy police investigation, being led by former Met commissioner Lord Stevens.
A police spokeswoman said the computer-generated model would recreate "exactly the movement of the car on the road" in the Pont d'Alma tunnel where the crash happened.
They would then try to reach "the best possible understanding of what happened", she added.
The car had been loaned to the Met with the assistance of the French authorities, the spokeswoman said.
An investigation in France found Mr Paul had been drinking, and was driving at high speed.
But Dodi's father, Mohamed Al Fayed, believes the couple were murdered.