the RAN director of submarine policy prepared a paper detailing the need to start considering a replacement for the ageing Oberons. The paper also raised the suggestion that the majority of the submarines be constructed in Australia and that the number of submarines be increased beyond the six Oberons. Building the submarines in Australia was initially met with reactions predicting an impossible task because of the poor state of the Australian shipbuilding industry, and Australian industry in general, although campaigning by several figures in Australian industry who thought it could be done came to the attention of those spearheading the project to design the Oberon-class replacement, and led to the view that it was both possible and feasible. The campaign to build submarines in Australia was also met with support from the Australian Labor Party and several trade unions. The proposal was accepted by the defence operational requirements committee in August 1978, and the project was given the procurement designation of SEA 1114. Approval for the development phase of the project was given in the 1981–82 federal budget. The RAN had four main requirements: that the submarines were tailored to operating conditions in the Australasian region, that they be equipped with a combat system advanced enough to promote a long service life, that appropriate and sustainable infrastructure be established in Australia to construct the boats, then provide maintenance and technical support for their operational lifespan, and that the submarines were capable of peacetime and emergency operations in addition to their hunter-killer role. Ten submarines were envisioned, a number which was revised to between four and eight boats by the start of 1983, and later settled on the acquisition of six submarines, with the option to order two more. Requests for tenders The development of the submarine commenced in May 1983, when the government released a request for tender and approached seven of the world's nine diesel-electric submarine manufacturers for submissions. The submissions would be narrowed down to two based on the provided information, with these undergoing a funded study to determine the winning design. Tendering companies had to demonstrate how Australian industries would be incorporated into the project, and that they were willing to establish an Australia-based consortium to construct the submarines. All seven companies responded by the end of the year: the combined submissions totalling four tonnes (9,000 lb) of paper. Directions Techniques Des Constructions Naval of France originally