@AC and others
'why is the sub not informed in real time?'
How exactly would they achieve that? Submarine being sneaky deep underwater, radio waves failing to penetrate said water how do you intend to inform them in real time? Google Communication with submarines to get an idea of the bandwidth they get down there, similarly they don't get GPS.
As for windows (of the glass kind), although you could put a window in a submarine, and some deep research vessels do have them, the visibility at the depths involved is pitiful as light tends not to penetrate more than a few tens of meters at best. There's not much point putting great big headlights on either as it would kind of give away the sub's position.
Oh and SOSUS doesn't cover the whole seabed, it's aligned along areas of interest like the GIUK gap where Soviet subs have to pass to get anywhere interesting. Which is probably no where near Western boomers operate.
Seriously if everyone could red The Hunt for Red October before posting it'd save a lot of time...