What type of detection is primarily focused on emissions from submarines?

The focus on emissions from submarines naturally aligns with passive detection methods. Passive detection involves monitoring and analyzing the sounds, emissions, or signatures that submarines emit while they are operating. This can include noise from the submarine's machinery, the sound of ocean water flowing over the hull, and any other acoustic signatures. Since submarines are designed to be stealthy and minimize their own emissions, passive detection relies on listening for these sounds rather than emitting signals to locate the submarine.

In contrast, active detection methods involve emitting sonar waves and then analyzing the echoes that bounce back from objects in the water, which can make submarines more detectable. Visual tracking relies on sight, which is not effective underwater. Magnetic scanning is another different approach that looks for changes in the Earth's magnetic field caused by metal objects but is not specifically tailored to detect submarine emissions.