Chennai, July 2, (ANI): Death toll in the collapse of an under-construction building in Chennai has risen to 42 as rescue efforts have been stepped-up to locate the trapped from the rubble. Last week, the 11-storey under-construction building collapsed in Tamil Nadu. District Collector of Kanchipuram district, Bhaskar, said a total of 69 people were pulled out from the wreckage so far. Improved technologies like drones have been deployed for tracing the bodies of the trapped workers.