Attack-class submarine

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The Attack-class submarine was a planned class of French-designed submarines for the Royal Australian Navy (RAN), expected to enter service in the early 2030s with construction extending until 2050. The project, which would have replaced the Collins-class submarines, began in 2007 as the Future Submarine program. In 2020 it was estimated to cost A$90 billion and would have been the largest and most complex defence acquisition project in Australian history. Australia's unique operating environment (including significant variations in ocean climate and conditions) and rejection of nuclear marine propulsion had led it to operate the Collins-class, the world's largest diesel-electric submarines, capable of transiting the long distances from HMAS Stirling to their deployment areas. In the early phases of the project, four design options were identified: purchase a military off-the-shelf (MOTS) design, modify a MOTS design for Australian conditions, design an evolution of the Collins class...

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