The conversation about acquiring nuclear-powered submarines continues to bubble along. Some commentators who previously supported acquiring conventional submarines to replace the current Collins class, such as former prime minister Tony Abbott, now favour the nuclear option. But as Abbott noted, the government has never fully investigated the nuclear option. Consequently there is no agreed factual baseline and many public claims about nuclear submarines are speculative and possibly questionable. It’s been suggested, for example, that acquiring the United States Navy’s current nuclear attack submarine, the Virginia class, would have a similar—or even smaller—cost to designing and building Naval Group’s Shortfin Barracuda here in Australia (for example, here and here).

Let’s assume the government is willing to toss its Naval Shipbuilding Plan out the window and that the US is willing to sell us Virginia class boats off-the-shelf from US shipyards. What would it cost? Attempting to compare two very different things, one of which exists, the other of which doesn’t, is a fraught exercise. But while the Shortfin Barracuda is likely to be the most expensive conventional submarine ever built, there are some good reasons to think that the Virginia would not be cheaper.

Let’s look at a very high level parametric comparison. The Virginia weighs in at around 8,000 tonnes. The Shortfin Barracuda looks like it will between 4,500-5,000 tonnes. So with everything else being equal, the Shortfin Barracuda would need to cost around 60% more per tonne to be more expensive. RAND Corporation’s 2015 study of the Australian shipbuilding industry suggested that building in Australia historically incurred a 30-40% premium compared to the United States, although that study was based solely on surface ships. The intent of the government’s continuous shipbuilding policy is to bring those premiums down, but even if that doesn’t occur, Shortfin Barracudas still look like they’ll be cheaper.

We can also compare the publicly available information about the two classes, noting that there is a vast gulf in the quality of information in the US compared to here. The US Department of Defense’s Justification Book for fiscal year 2019 for shipbuilding (p. 37) provides a unit cost for a Virginia class submarine of US$3.25 billion. If we multiply by 12 and convert at current exchange rate that makes around A$53.7 billion (of course, if the Aussie dollar sank, that number would go up).

We don’t know what Defence has estimated the unit cost of a Shortfin Barracuda to be (and likely never will). In response to questions at Senate hearings, Defence officials have stated that the estimated total acquisition cost of the future submarine program, which is designing and building 12 Shortfin Barracudas, is around $50 billion ‘constant dollars’ (a measure which doesn’t take inflation and price escalation into account). The cost of Australian projects includes everything needed to bring a capability into service. In the case of the future submarine program that likely includes wharves, training and testing facilities, simulators, and so on.

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