Yates,
You raise a good point about whats below the ground where the extension will go.
Well they had to do an archaeological dig as part of the agreement to build it, which finishes 2 weeks ago, looks like nothing was found.
They also did extensive bore drilling and soil sampling late last year on the entire area.
In relation to not much digging..there will be a fair bit.Although the area where the runway extension will go is in a dip and will need a lot of filling in.
Where the extended taxiway will go, theres a hill the current A45 petrol Stn it at the top of it.So thats will have to be dragged down with those huge earth movers..
Nigel