Diagrams for relative dating
This is where cars and lorries are put on the Eurotunnel car-carrying shuttle trains to go through the tunnel to France.
Your Eurostar train passes through the middle of the terminal non-stop, and the train manager announces that you are about to enter the Channel Tunnel.
The tunnel is dark, so nothing to see, and no, you can't see the fishes...
But the Eurostar soon bursts into the daylight again at up to 100 mph, and you're now in France.
Some Eurostar trains now call at Ebbsfleet station in north Kent, near the M25 motorway.
Just 35 minutes from St Pancras, the fields and hedgerows of east Kent give way to the roadways and check-in lanes of the Folkestone Eurotunnel terminal.
To the left of the train, over the top of the adjacent M2 motorway bridge, you can see Rochester Cathedral and Rochester Castle in the distance.
Now at last you're in green and pleasant rural Kent, with villages nestling at the foot of the chalky hills to the left.
A handful of Eurostar trains call at Calais-Frthun, a few miles from Calais town centre, but others just start accelerating onto the French high speed line.
Unlike conventional railways, the high speed line follows the contours of the land more like a motorway, and you will feel the Eurostar rising onto the hills and settling into the dips.
Just 10-12 minutes from St Pancras you'll see the impressive Queen Elizabeth II suspension bridge on the right, which carries the M25 London orbital motorway across the River Thames at the Dartford Crossing.