- This is noting the last time Australian submarines fired torpedos in anger - was 1915 near Gallipoli. There were no Australian submarines operational during World War Two.
- On the more usual intelligence collection function - there are other platforms and other countries' submarines that will continue to contribute.
- Large unmanned underwater vehicles (UUVs) launched from northern Australia may offer a new intelligence-collection solution. These could utilise the rapid advances in Lithium-ion batteries.