The Supertech twin towers in Noida were brought down today in a massive explosion. The blast, lasting about nine seconds, caps a nine-year legal battle between residents of Supertech Emerald Court in Sector 93A and the realtor over the two towers. The demolition done, the next challenge for Noida authorities is to clean the mountain of debris generated due to the demolition. Officials involved with the operation had earlier said about 55,000 tonnes of debris would be generated. It may take as much as three months to clear the debris. The waste will be dumped at designated areas.