The company selected to build submarines for the Royal Australian Navy under the Future Submarine Program is Naval Group. Naval Group is a French defense contractor specializing in naval defense and marine renewable energies.
The Future Submarine Program, also known as the Attack-class submarine program, involves the construction of a new fleet of submarines to replace the aging Collins-class submarines. These submarines are expected to be built in Australia, primarily in the city of Adelaide, South Australia.
Please note that the status and details of defense contracts and programs can change over time, so I recommend checking the most recent news and official government announcements for updates on the progress of the submarine construction and any potential changes to the contractors involved.