ASC - Building and maintaining Australia’s frontline naval defence capabilities ASC Pty Ltd has proudly served as Australia’s sovereign submarine builder and sustainer for over 35 years. ASC built the Collins Class submarines and now sustains and upgrades the fleet at its facilit ASC exists to serve the frontline of Australia’s naval defence capabilities. With more than 2,600 employees across our three facilities in South Australia and Western Australia, ASC has evolved into Australia’s largest specialised defence shipbuilding organisation, with naval design and engineering resources unparalleled within Australia’s defence industry.