The Supertech Twin Towers in Noida's Sector 93A were demolished on Sunday in a matter of seconds, nine years after a citizens group sued the builders.

The illegal towers were demolished using the implosion technique while a huge cloud of dust was created, in a display of amazing modern engineering.

3,700 kilogrammes of explosives were drilled into the walls and pillars of the two residential buildings to raze the 100-meter-tall towers.

Over 3,700 kg of explosives were placed into the two towers, Apex and Ceyane. Approximately 7,000 holes in the pillars were filled with explosives.

An insurance policy of Rs 100 crore was used for the demolition operation to also cover any damage to nearby properties.

In order to prevent the explosion from damaging nearby structures, the area had been evacuated hours before the incident.

By about 10 a.m. on Sunday, approximately 5,000 residents of the nearby societies had been evacuated. 200 pets and roughly 200 vehicles were also removed from danger.

Residents started heading home after 7 o'clock. Lines for cooking gas and electricity were reconnected. The Noida-Greater Noida expressway was shut down for 27 kilometres.

A massive cloud of dust quickly surrounded the neighbouring areas, covering the entire skyline and buildings in a thick dust cover for up to 30 to 60 minutes.