Just above is an excellent Indian submarine Youtube. It is about INS Sindhukirti a Kilo (called Sindhughosh class in India) submarine designed and built by Russian shipbuilder Sevmash.
Looking at the Youtube:
3min 25secs - in shows many advanced looking combat system and steering screens
7m 40s - battery checking, a very arduous looking manual task done twice a day. Perhaps remote sensor system checking batteries would be more effecient.
8mins - amazingly cramped and hot engine room. Pays not to be 6 feet tall!
9m 50s - Indian ELF antennass at INS Kattabomman in southern India aid in submarine navigation/positioning and to send commands to subs in the Indian Ocean
12m - crew is 53, but "average of 70 serve on board". Presumably for short missions?
15m 30s - selection, recruitment, training,
20m 20s There is a need for reform and major updating in India's submarine program, new subs needed. China's subs are much more modern.