Since the earthquakes parts of Christchurch have dropped by up to a metre.
And when you are at sea level, or not much above it, that metre drop can be a disaster. There are now 1300 properties at risk of tidal flooding that were not at risk before the quakes.
What makes this disaster a nightmare is that while insurers are rebuilding earthquake damaged homes, some are planning to do so at current floor levels.
Natasha Utting talked to some of those affected.
Watch the video for her full report