google HMAS Adelaide propulsion problems. Here is one report of many.
Navy's billion-dollar vessels mostly 'ship-shape' after years of engine troubles - ABC News (Australian Broadcasting Corporation)
"Almost three years to fix". "It appears she can now get from point A to point B."
These things cost $1.5 billion each and were years late in construction and delivery and have spent years since out of action with a dud propulsion system. Not good enough. Heads should have rolled and plenty of them. Both naval and public service. It appears our Defence purchasing people are the wood ducks of the used car trade. Poms sold us rubbish for a century when we were in our British to the bootstraps mode and the yanks have done the same with those used ships that were piles of pus.

