The correct answer is INS Mahe. It is an Anti-Submarine Warfare Shallow Water Craft (ASW-SWC) commissioned by the Indian Navy in November 2025. Vessels of this class are specifically designed to detect, track, and neutralise submarines operating close to the coast, and to carry out subsurface surveillance in shallow littoral waters where larger warships are less effective.

The Mahe class is being built indigenously, reflecting India's push for self-reliance (Atmanirbhar Bharat) in defence shipbuilding. Such craft typically carry sonar systems, lightweight torpedoes, and anti-submarine rockets, and are used for coastal patrol, mine-laying support, and protecting harbours and sea lanes from hostile submarines.

Why the other options are incorrect: INS Vikrant is India's first indigenously built aircraft carrier, commissioned in 2022 to project air power at sea, not a coastal anti-submarine vessel. INS Arnala is another ASW shallow-water craft but is associated with an earlier commissioning and is a different unit from the one referenced here. INS Ikshak is a hydrographic survey vessel whose role is charting the seabed and coastal waters, not anti-submarine warfare. Only INS Mahe matches both the November 2025 timing and the anti-submarine, coastal-defence purpose described.