Now that you all have beaten up the drum, lets talk about serious analysis.
The snorkel mast, ESM/Comms mast, and search periscope are up. From the shape, it is likely to be a kilo class. The method of detection is likely to be a iSAR radar on P3, queued by Star Safire II FLIR, video of which you see in WHOT / contrast mode.
This method is what we call "war patrol." Since submarines are the only true offensive arm, the deployment of submarines during peacetime is always in the enemy waters in predetermined locations. This is either an intelligence failure, where the location has been compromised and PN assets have picked it up, or this is a submarine in technical repair, hence it has raised the snorkel mast to charge its batteries or get propulsion assist. No submariner is stupid, and I don't think the Indians are either. Traversing the water with the masts up creates a wake (you can see it in the video) and you can see it 60 NM in the air on FLIR.
Regardless, this is the Sub CO saying, don't shoot, i am in trouble and leaving. The propaganda people can say whatever for or against it.