AUKUS Pillar 1 now sits with the industrial leaders now tasked with turning a trilateral agreement into delivered capability. This panel brings together the business leads responsible for the nuclear-powered submarine enterprise across the three partner nations to examine how the industrial base is actually being built, from shipyard infrastructure and long-lead procurement to workforce generation at the scale the Optimal Pathway demands. Discussion covers the mobilisation of the supply chain and the qualification of new suppliers, the commercial and contractual arrangements binding three sovereign programmes across a multi-decade horizon, and the practical effect of export-control reform on day-to-day delivery. The session asks what it takes to move from political commitment to boats in the water, and where the programme's commercial risk genuinely lies.