It's possible to justify choosing any of the new submarine bids.
The Swedish/Australian one? We did that last time and it worked.
The French? Has the potential to go nuclear.
The German? Worth pursuing.
The Japanese? Possibly, but not if it locks us into an alliance with Tokyo; will be built in Japan; and if the Japanese won't explain any of the advantages publicly.
How many hulls in this picture?
We'd be better off without one, as I suggest in this piece for the Canberra Times . . .