It's at Holbrook NSW .formerly called Germantown
The captain of AE-1 an Australian Submarine sunk in the Dardenelles Turkey in WW1 was born in Holbrook.
There is an excellent museum adjacent to the Submarine.
Only the deck & conning tower are in the park sitting on a foundation of concrete shaped to resemble the pressure hull
My brother in law was a crew member on board ovens a sister boat to Hmas Onslow on its maiden voyage from Scotland
It was built by browns in Greenock on the Clyde.
The rivers class. Boats were the the most stealthy of all current Submarines at that time,diesel electrics being much quieter than Nuclear boats