Massive Chinese bridge demolished
20 March 2012 Last updated at 13:09 GMT
A huge road bridge in Nanjing in China has been demolished.
It's to make way for a new road to be built.
Security workers made sure that thousands of residents were moved away from the site first.
The demolition took just 4.8 seconds and used 1,200 kilograms of explosives and 5,500 detonators.