Getting those decisions based on the science was important, and I want to particularly thank GNS for the work that they did. They are an internationally recognised body that's perhaps not well enough appreciated here at home. They worked with Tonkin + Taylor, the engineers, they worked at pace, and they got a very good picture of what the city looked like below its surface. But that was a hard decision to make, not only for those who were advising Cabinet; for Cabinet itself.