The Collins-class submarines are Australian-built diesel-electric submarines operated by the Royal Australian Navy (RAN). The Collins class takes its name from Australian Vice Admiral John Augustine Collins; each of the six submarines is named after significant RAN personnel who distinguished themselves in action during World War II. The six vessels were the first submarines built in Australia, prompting widespread improvements in Australian industry and delivering a sovereign sustainment/maintenance capability.

AUKUS, also styled as Aukus, is a trilateral security partnership for the Indo-Pacific region between Australia, the United Kingdom, and the United States. Announced on 15 September 2021, the partnership involves the US and the UK assisting Australia in acquiring nuclear-powered submarines. The partnership also includes cooperation on advanced cyber mechanisms, artificial intelligence and autonomy, quantum technologies, undersea capabilities, hypersonic and counter-hypersonic, electronic warfare, innovation and information sharing. The partnership will focus on military capability, distinguishing it from the Five Eyes intelligence-sharing alliance that also includes New Zealand and Canada.