This sources sought notice is for market research only and seeks eligible small businesses to investigate and repair the active Raw Water Intake and timber crib structure and remove/dispose of Zebra Mussels and marine deposits at Naval Station Great Lakes, IL, with work performed at the Naval Station Water Treatment Plant. Qualified firms must provide Project Manager supervision of a qualified dive crew, boat operators with boating safety certification, and divers with at least one year of commercial diving experience, four similar working dives, one within six months before award, and current CPR/first aid/emergency oxygen/OSHA qualifications. The contractor would furnish all labor, tools, transportation, supervision, materials, inspections, equipment, and safety compliance, and work may include penetration diving inside raw water intake piping. The anticipated contract award is June 2027, and the applicable NAICS code is 238990 with a $19 million small business size standard. The requirement may be set aside for small business with FAR 52.219-14 limitations on subcontracting or issued unrestricted if insufficient small business interest, and the Contractor Information Form is the required response vehicle for demonstrating small business status and relevant experience.