Scotland Yard Commissioner Sir John Stevens will retrace Diana's movements the night of the crash that killed her as her car traveled at high speed through a tunnel in central Paris.
"We will be looking at the scene of what has taken place. Obviously, statements, videos and pictures are being seen. But it's very important that I actually have a look at the scene," says Stevens.
"Today is all about going to the scene. We'll be driving a car down there. We'll be looking at the scene and also I'll be meeting my French counterpart."
A thorough of the accident discounted conspiracy theories that suggested Diana was killed because she was pregnant by her Egyptian lover, . The French report instead blames the driver of the Mercedes, Henri Paul, for driving under the influence of both alcohol and drugs.
Now, seven years later, a team of British detectives working for the royal coroner will conduct its own investigation – in a final attempt to end speculation about the death of Britain's most famous princess.
The inquest report is expected by the end of this year.