The collapse of the building in Shanghai (27 / 06 / 2009)

To realize how the geotechnical engineering's job is important, we sometimes need to take a look at some building disasters and try to understand what are the reasons that led to these catastrophic situations.
This is the case of an unoccupied building still under construction at Lianhuanan Road in the Minhang district of Shanghai, which collapsed, killing one worker. 
We are dealing with a large construction, a 13-story building, newly constructed, which litteraly toppled over. 

These pictures reflect the scale of the accident.










Here is a video giving a short explanation of the situation :
https://www.youtube.com/watch?v=TGHqXM5OGtY