Underwater commercial diving services in the field of underwater construction, repair and maintenance; Hazardous waste clean-up services; marine construction; installation of chlorine lines; installation of traveling screens; installation of backup generators; installation of sea walls; installation of docks; yacht and boat conversion, renovation, refit and repair; pump repair; Consulting services for the construction of water treatment and purification plants, solid waste treatment plants and other municipal infrastructure facilities; installation and maintenance of irrigation systems; pipeline construction and maintenance; underwater construction; underwater repair; underwater dredging; general construction contracting; repair or maintenance of nuclear power plants