Besides rushing in with rescue teams, the armed forces have also launched UAVs to assess the situation.
Indian Army's four columns, including troops from the Garrison Infantry Battalion located at Chennai besides one column rushed in by road from Bangalore, continue to carry out extensive rescue and relief operations at Tambaram, Mudichur, Manipakam, Guduvancheri and Urapakkam areas.
The Army is addressing the most critical areas where flood water levels have reached 10-12 feet, sources said.
The Army column located at Guduvancheri and Urupakkam have rescued over 600 marooned people in Waigai Nagar and Priya Nagar.
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The Army column at Manipakkam has evacuated over 800 people, including students in and around Kutheri, to safer places.
Another Army column operating at Mudichur has rescued over 750 people by 4 pm.
The rescue column from Bangalore was deployed this morning for rescue operations at MIOT hospital, Guindy from where it successfully evacuated over 200 people including patients.
Additional two columns have been kept on standby in Secunderabad in Andhra Pradesh for any contingencies.
With civil communication non-functional in several areas of Chennai, the Army is resorting to radio communication for coordinating rescue operations.
The Navy too has chipped in with three teams.
Following incessant rains in Nellore district of Andhra Pradesh and in large parts of Tamil Nadu, requests were received by the Air Force from the two governments for positioning helicopters at Tirupati and Tambram.
As soon as the weather is fit for helicopter operations, these will move to Chennai to assist the state disaster management authorities in their efforts to provide succour to those hit by the deluge.
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Army sources said its 16 rescue and relief teams, along with four teams of engineers, have been deployed so far.
Meanwhile, ships are being put on standby for Helo/RPA sorties. NCC Puducherry is put on standby for providing boats for flood relief. Shelter for housing for 100 personnel is kept ready at INS Adyar, a release by Visakhapatnam-based Eastern Naval Command said.
Medical teams have also been kept on standby. INS Airavat is being rushed to Chennai with relief material.
Unmanned Ariel Vehicles (UAVs) are being launched for assessment of situation in area, it added.