In sonar everything depends on conditions. 3nm can be perfectly realistic under some conditions. But yeah, I too think it is quite low range.
Anyway, launching all torpedoes, you must expect someone to notice. With deep water and long range torpedoes, you can launch them from below the layer, or navigate them around the target. Also you can launch them much further away. In such case, torpedo will be detected at different location then you are. But with Kilo, all this is difficult. This is DW world.
IRL, I actually have no idea how well torpedoes can be detected, but I think it should be more or less like in DW. Torpedoes are loud.
Once I killed whole carrier group with Kilo, and I almost didn't fire a shot. I got inside the group, not that I wanted, but Kilo is so slow I could not evade .. then I got detected .. and then all escorts started to fire torpedoes at me .. but all torpedoes happily went for the 'bigger fish'. Two escorts also crashed into each other. I slowly moved away, and then finished the survivors.
Still it was bad AI, and it might not work with today's patch/mod level. It would not work for sure IRL.
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