Here we are in the cockpit of a P-3 Orion, the subhunters platform of choice.
Russian satellites snap photos of departing subs then Russian subs try to track em.
We track the Russians. Today most Russian subs are rusting in Vladivostok harbor. The P-3s try to identify subs by their sound, droping hydrophone arrays, detecting their magnetic signatures, and using other techniques. Intel's Internet-based flight simulator was like Doom, except you fly though the corridors. Play with others around the world.