But he had one thing: the old submarine's soul.
All he heard was the sea. Silent. Peaceful. And for the first time in fifty years, utterly empty of ghosts.
The film depicts the courageous actions of the Indian Navy's frigate, INS Rajput, under the command of Captain Mukul Shorey (played by Rana Daggubati), which intercepted and engaged the PNS Ghazi in a fierce underwater battle. Despite being outgunned and outmaneuvered, the Indian Navy crew displayed exceptional bravery and tactical acumen, ultimately sinking the Pakistani submarine.
He scrambled to the control room. His grandfather had told him how Ghazi 's crew used acoustic deception—slammed pipes, air bursts, false cavitation—to mimic a larger fleet. Arjun began to play the Karmaveer like a dying organ.
The Indian Navy, having intercepted intelligence about this mission, dispatches the ageing submarine S-21 for a secret reconnaissance mission. The crew of S-21, led by the aggressive Captain Rann Vijay Singh and the methodical Lt. Commander Arjun Varma (Rana Daggubati), must navigate personal conflicts while facing the imminent danger posed by the advanced Ghazi.
"Command, this is Neptune," the pilot radioed. "Target is broadcasting audio. It's… 'Ae Mere Watan Ke Logon.' Request abort. That's a memorial song."