India along with US, Japan and Australia started the 'Malabar' naval exercise in Bay of Bengal.
Navies of all four countries carried out anti-submarine warfare operations and naval maneuver at sea.
Indian Navy's Ranvijay, Shivalik, Shakti, Sukanya and submarine Sindhuraj are exercising these operations with USS John S McCain, HMAS Ballarat and JMSDF Ship JS Onami.
India, US, Japan and Australia are a part of 'Quad' alliance.
