Guided missile frigate INS Betwa which suffered a mishap at the Naval dockyard in Mumbai while it was at the dry dock in December, is back on even keel. <br/><br/>Two crew members were killed in the incident. A Defence spokesperson said that INS Betwa is back on even keel and floating like any other warship. It shall be operational before April 2018.<br/><br/>The incident had occurred during undocking evolution and it was suspected that the dock-block mechanism had failed. The mast of the ship has hit the ground on the left side.<br/><br/>INS Betwa is a 4000 tonne frigate of the Brahmaputra class built by Garden Reach Ship Builders of Kolkata and entered service in July 2004.