Bus tours into Christchurch's earthquake-ravaged city centre red zone begin this weekend, giving the public a chance to see inside the cordoned area for the first time.
But those wanting a seat on a bus through the CBD red zone are being urged to pre-book as organisers prepare for a rush on tickets.
Places on the buses will be managed by the Canterbury Earthquake Recovery Authority (Cera) through a booking system.
When people call they will be asked several safety questions so that the potential danger of being in the CBD is made clear to each person, and Cera will record who is on each bus.
Warwick Isaacs, Cera general manager of demolitions, says the CBD is an active worksite, as well as being a dangerous place should another large earthquake occur.