This is a market research notice seeking companies capable of providing worldwide diving and underwater maintenance services for ship hulls and structures. The services include air, mixed gas, and saturation diving, along with related engineering and technical support, in support of salvage and underwater ship repair missions. The Government is contemplating an Indefinite-Delivery/Indefinite-Quantity (IDIQ) contract with cost-plus-award-fee task orders. Interested parties must submit a detailed expression of interest, including a comprehensive financial capability statement and examples of recent similar work. Responses must be sent via email to the specified contacts.