Easy way to not be found is to not emit energy be it sound, heat, light, radio frequency, etc... until we discover a passive sensor that works underwater that c

Easy way to not be found is to not emit energy be it sound, heat, light, radio frequency, etc... until we discover a passive sensor that works underwater that can see static objects that may not emit energy, seamounts and other things that change the map are occupational hazards for submariners.