Indicator) was a Sandhayak-class hydrographic survey ship in the Indian Navy.

As a hospital ship, Nirupak has taken part in disaster relief exercises.

[4] On a goodwill mission in 2010 the ship visited Trincomalee Port.

[5] The primary tasks of INS Nirupak include hydrographic surveys, nautical chart preparation, cartography & training.

It was actively engaged in Humanitarian Assistance and Disaster Relief (HADR) operations, including Operation Gambhir in 2004, offering critical relief as a hospital ship to Indonesia.