Hydrographic survey data for more than 7,000 nautical miles was collected during a two-month-long exercise and details of the survey were handed over to the Sri Lankan Navy at a ceremony in Colombo yesterday.
Interestingly, Sri Lanka had on Wednesday rejected China's request for its submarine to dock at Colombo next week, after a similar visit in 2014 triggered strong protest from India. China has been making consistent efforts to make inroads into the island nation.
He said Indian naval ship Darshak was on a two-month-long deployment in Sri Lanka to carry out the survey.
The survey operations were undertaken in three phases and the ship also visited Colombo and Galle harbour. A Chetak helicopter was also deployed as part of the data collection exercise.
"The ship and its survey motor boats fitted with multi- beam systems were extensively deployed and the hydrographic survey data for more than 7,000 nautical miles was collected," said Sharma.