This is a sources sought notice for market research, not a solicitation, to identify contractors capable of supporting emergent submarine repair, including nuclear-related supplies, engineering services, and trade labor. The work supports nuclear-powered submarines, special mission submersibles, moored training ships, and submarine support facilities. Contractors must comply with CMMC Level 2 cybersecurity requirements to handle Controlled Unclassified Information. The estimated ordering period is May 2027 through May 2032, and no budget amounts or performance location are specified. The government may limit competition to General Dynamics Electric Boat and Huntington Ingalls Industries Newport News, the only known nuclear-qualified shipyards.