Watch the latest City Rail Link (CRL) construction in action - in these time-lapse videos.
Check out how different Lower Queen St in front of the Chief Post Office (CPO/Britomart) is looking now as tunnel development appears.
These construction time-lapses will also take you inside the CPO building and to the Fletchers Commercial Bay tunnel development.
On Lower Queen Street, CRL has started excavating the 14-metre deep trench that will contain the project's twin rail tunnels between Britomart Station and the Commercial Bay development.
This follows two years of preparation work to protect Britomart's historic Chief Post Office building and support the ground before the trenching and tunnel construction began.
A single 25-metre trench will be excavated on Lower Queen Street and two 10-metre wide trenches under the Chief Post Office building.
Tunnel box construction will start at the location at the end of this year. The weight transfer of the building onto a series of underpinning frames is completed.