There are few things more hidden and precious in the U.S. defense arsenal than the production process for nuclear submarines. The United States shared those secrets only once before, with Britain in 1958, and is doing it again, for the second time, with Australia. This builds on the long-standing Five Eyes intelligence-sharing agreement among the three countries that also extends to the other two Anglo-Saxon nations, Canada and New Zealand, whose geographies and small populations make them geopolitically less relevant.
