Singh believes that they should track down Ghazi and attack, while Arjun obstructs, reiterating his instructions. Singh then orders the ship's EXO, Lt. Commander Santosh Devraj to conduct a drill and target Ghazi while doing so, despite Arjun's protests. They fire a torpedo, which misses Ghazi narrowly, thus alerting them of their presence. Aware of the enemy's presence, Razak orders his crew to head towards Visakhapatnam Port at full speed and to set up mines en-route, planning to destroy S21.
Ghazi, now having the ability to attack S21, fires six torpedoes, all of which are avoided by S21 through depth changing maneuvers, much to Razak's frustration. S21 dives to 350 m, in order to slip from Ghazi's sonar range despite being designed for a maximum of 250 m depth. With very limited battery support, Arjun instigates Ghazi into attacking by transmitting his crew singing 'Saare Jahaan se Achchha' and the Indian National Anthem. Riled up by S21's defiance, Razak orders another torpedo attack on S21, for which Ghazi will have to turn by port 180 degrees. Arjun dives into the flooded forward compartment to manually trigger the torpedoes, successfully managing to do so. Ghazi also launches its torpedo at the same time. The torpedo launched by Ghazi misses S21 narrowly, but it is hit by S21's torpedo and disintegrates in the water, killing the entire crew. S21 surfaces and the crew manages to save Arjun from the flooded compartment in the nick of time. S21 is later saved by a patrolling Indian Navy vessel. 2b1af7f3a8