http://www.hindustantimes.com/mumbai-news/ins-betwa-slips-at-naval-dockyard/story-XZvwjQ1qKlTSeHMI83HUGM.html

"INS Betwa had run aground in January 2014 and collided with an unidentified object that led to a crack in its sonar system, and had also seen saltwater ingress into sensitive equipment."