Throughout Delhi are ramshackle buildings. Some are 150 years old with shallow foundations and others have none at all. An intensive monitoring operation has been carried out consisting of over 1,000 survey points to ensure that nothing falls down unless it is supposed to. 'We have carried out several controlled collapses and had to evacuate a few buildings, ' says Dayal.
The digging of unauthorised wells has also required lots of additional survey work but so far there have been no collapses resulting from encounters with uncharted shafts.