Oftentimes , a song and dance explains complex matters best, especially when dealing with polticians blinded by votes, or "intelligence" organisations which are anything but, and the otherwise ignorant.
As this writer has said before:
one ought to be able to estimate Chinese submarine technology using Russian technology as a proxy.
Australia's Department of Defence has also indicated that the highly stealthy Collins class submarines and P3-Orions (these days kept at home in Darwin) will be used in the exercise.This sounds more like an act of desperation by a department trying to show that it is doing something.
If all that is still too complicated , see