The three groups bidding to build Australia's next fleet of submarines will come together for the first time to present details of their plans in a public forum in Adelaide.
Representatives from the Japanese, German and French groups will make presentations on Tuesday at the Submarine Institute of Australia conference.
It is likely to be their final chance to speak openly about their bids before the federal government's deadline for submissions in its competitive evaluation process.
"Given bids must be submitted by November 30, the conference is set to be the last chance for the proponents to publicly state their cases ahead of this deadline," Submarine Institute of Australia executive director David Nicholls said.
If successful the French plan to build a sub called the Shortfin Barracuda Block 1A, which has been designed specifically for the Australian Navy.
It is 97 metres long and uses pump jet propulsion instead of conventional propellers.
The Japanese have proposed building a submarine based on the Soryu Class subs currently in service.
German group ThyssenKrupp Marine Systems has offered less information about its proposed design but has pointed to its experience in the industry, having built 160 subs since 1960, including 120 for export.
Tuesday's conference will also hear from recently appointed Federal Defence Minister Marise Payne.