The Indian Navy suspects Pakistani intervention in Indian waters and therefore launches a recce mission which is led by Captain Rann Vijay Singh (Kay Kay Menon), Lieutenant Arjun Verma (Rana Daggubati) and Officer Devraj (Atul Kulkarni). Captain Rann Vijay Singh is an aggressive officer while Arjun Verma has been assigned the duty to maintain peace.

Pakistani war submarine PNS Ghazi with their Captain Razak is planning a dreadful attack on INS Vikrant in order to reach East Pakistan by sea. They create diversions, plant explosives, and shoot torpedoes among other things to destroy Indian Submarine S21. The story further unfolds when Indian officers take it all on themselves to safeguard Indian coast and fight back the enemy.