Workers and sailors wave from the warship INS Chennai after it was launched from the Mazgaon dock in Mumbai on Thursday. The third and last of the Kolkata-class warships, the INS Chennai, a 6,700-tonne destroyer 163 metres long and 16 metres wide, was launched using the pontoon-assisted method by Ms Elizabeth Antony, wife of defence minister A.K. Antony. The ship will be armed with the supersonic BrahMos surface-to-surface missile system and long-range surface-to-air missile system as well as   indigenously-developed twin-tube torpedo launchers and rocket launchers.     PHOTO: AFP