Thousands of people are getting their first glimpse inside Auckland's City Rail Link tunnels.

Only 10,000 people have tickets for today's highly anticipated Walk the Tunnels event, with many more missing out on tickets.

Most of the first people inside the tunnel are families. Many are taking large family photographs at the deepest accessible point.

Access is being staggered, with people being given times to view throughout the day.

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Transport minister Phil Twyford was among the first inside the tunnel at 8am.

Sean Sweeney, CEO of the City Rail Link looks through the tunnels under Albert St ahead of the Open Day. Photo / Greg Bowker
Sean Sweeney, CEO of the City Rail Link looks through the tunnels under Albert St ahead of the Open Day. Photo / Greg Bowker

He said he liked what he saw, and it was good to see progress on a key part of the Government's transport plan.

City Rail Link Ltd Chief Executive Sean Sweeney said he had been positively surprised by the unprecedented interest in the event.

He said while there would not be another Open Day in the near future, he was hoping for further open days for other parts of the project before the City Rail Link is completed.

Works continue for the City Rail Link as the tunnels start to take shape under Auckland's Albert St. Photo / Greg Bowker
Works continue for the City Rail Link as the tunnels start to take shape under Auckland's Albert St. Photo / Greg Bowker
City Rail Link Ltd chief executive Dr Sean Sweeney, left, and CRL construction manager Scott Elwarth in a completed section of tunnel earlier. Photo / Jason Oxenham
City Rail Link Ltd chief executive Dr Sean Sweeney, left, and CRL construction manager Scott Elwarth in a completed section of tunnel earlier. Photo / Jason Oxenham