This is a sources sought notice for market research only, not a request for quotes or proposals, to identify interested and capable firms for environmental consulting services. The work involves conducting deep-ocean benthic sampling at the San Francisco Deep Ocean Disposal Site, located 50 miles offshore of the Golden Gate, using a vessel over 150 feet with an 8-man crew and specialized equipment. The contractor must provide personnel, a suitable vessel, a Sandia MK-III box corer, and documented deep-sea sampling experience at depths over 2,500 meters, with operations running around the clock. The anticipated period of performance is May 1, 2027 through April 30, 2030, with the base year sampling cruise proposed for September/October 2027 and a solicitation expected around October 2026. Interested firms must demonstrate relevant experience and capability, and be registered in SAM, to be considered in the acquisition decision.