The terrifying conditions firefighters were working with inside the New Zealand International Convention Centre can be seen for the first time.
The cause of the blaze in central Auckland remains unclear, but Fletcher Building has confirmed blowtorches were being used on the roof on Tuesday, the day the fire broke out about 1.15pm.
In the video footage, shot at 12.30pm yesterday, flames can be seen leaping in the roof overhead while firefighters continue to dampen down hot spots.
Fire and Emergency said the firefighters inside were being helped by aerial appliances outside at the time the footage was filmed.
At the time the video was shot, the fire had been blazing in the under-construction roof for 48 hours.
Fire crews continue to work in the building and are still in "active firefighting mode", incident controller Dave Woon said today.
Work also included an "overhaul" phase as firefighters pull off iron and roofing and sealing materials from the roof.
Fire and Emergency said it was hard to say how long the surrounding CBD roads would remain closed, Mark Shaw, who is leading the recovery team, said.
"It may take a couple of days, or up to a week."
