This is a Sources Sought notice for market research only; no solicitation is available, and responses are not offers. Portsmouth Naval Shipyard seeks sources capable of supporting a firm-fixed-price contract to refurbish CO2 scrubber and COH2 burner systems on a Virginia Class Submarine, requiring access to OEM proprietary data, drawings, and information. Interested firms should provide organization details and tailored capability statements with supporting documentation; questions may be emailed to Alyssa Scarelli, and telephone inquiries will not be accepted. Information received will be used solely to determine the acquisition method and whether to conduct a competitive procurement, with no obligation for the government to award a contract or pay for response preparation.