Engineer Jason Bretherton can vividly recall the mad scramble out of bed in the early hours of September 2010 to check on his kids after the first earthquake hit his hometown of Christchurch.
It's also become a defining point in his career at Opus International Consultants as he and his engineering colleagues work to rebuild parts of the city destroyed by the quakes.
"From an engineer's point of view we function by responding to those sorts of events," he says.
Bretherton, who heads up Opus' Christchurch-based mechanical and electrical engineering team, says the rebuild has entered a phase that means taking the rebuild vision and introducing the best in new technology to create a smart, efficient city for the future.