INS Sagardhwani (A74)
 INS Sagardhwani (A74) is a marine acoustic research ship (MARS) owned by the Naval Physical and Oceanographic Laboratory (NPOL) maintained and operated by the Indian Navy and based at Southern Naval Command Kochi.The ship was built by Garden Reach Shipbuilders & Engineers Kolkata launched in May 1991 and commissioned in 1994.