The Australian Navy is investing in two different submarine technologies to counter the rising power of China. One approach involves building expensive nuclear-powered submarines, while the other focuses on developing cheap and fast unmanned submarines powered by artificial intelligence (AI), known as Ghost Sharks. The Ghost Sharks, costing less than 1% of the nuclear submarines, will be delivered by mid-2025. The use of AI and automation is revolutionizing military power and could potentially reshape the rivalry between China and the US.