New Delhi: A fire at a New Delhi data centre owned by Singapore's ST Telemedia and India's Tata Communications caused "extensive damage" to parts of the facility, making data recovery challenging, a Tata letter seen by Reuters shows.The company told stock exchanges on June 5 it had activated business continuity protocols to minimise disruptions after an early morning fire at the STT Global Data Centres India facility.One data centre client, Matrix Cellular, which provides international SIM cards, told Reuters it is struggling to recover two decades of data lost in the blaze.Also Read: Fire breaks out near Tata Communications-linked facility in Delhi; company monitoring situationSome of Google Cloud's intermittent network disruptions in India also relate to the incident, a source with direct knowledge of the matter said.Television news images from inside the facility on the day of the fire showed server racks and electrical infrastructure that appeared to be completely burnt, with ceiling panels collapsed and debris littering the floor.