37 Construction, construction supervision, installation, repair, modification, maintenance services of industrial plants and infrastructure to produce, refine, conduct, storing, transporting and distributing fluids and liquids, in particular water, hydrocarbons, petroleum, gas, natural and refined gas, liquid gas and chemicals; construction, construction supervision, installation, repair, modification, maintenance services of petrochemical plants, chemical installations, distribution networks for the transport of fluids, liquids and fuels, in particular water, hydrocarbons, petroleum, natural and refined gas, gas and liquid gas, or fuel gas, gaseous mixtures of fuels; installation of environmental engineering systems; construction, repair, modification and maintenance services of installations for the production, storage and transport of energy; construction, repair, modification and maintenance services of installations for the production of fertilizer; construction of onshore and offshore wells for exploration and production of oil and gas fields or for geothermal power; construction, construction supervision of floating means in the nature of barges, semisubs, vessels and platforms, boats or subsea means in the nature of submarines, AUT (autonomous underwater vehicles), ROV (Remotely Operated Vehicles) and subsea packages and modules; construction, construction supervision of railways, rail networks and infrastructure in the nature of railroads, bridges, tunnels, viaducts, overpasses and underpasses for the transport of people and goods by rail; construction, construction supervision of marine, lake and river infrastructure in the nature of bridges, harbors, jetties, weirs, dams; construction, installation and maintenance of subsea factories and subsea equipment for extracting and processing oil and natural gas; construction, installation and maintenance of offshore equipments, infrastructures and installations for the production of energy; remote operated vehicles (ROV) maintenance and remote operated vehicles (ROV) upgrading services; maintenance of subsea machines and equipment; trenching and ploughing services, excavation and seabed preparation services for pipelines and for subsea installations; remote operated vehicles (ROV) services, namely installation and laying of pipelines and construction of subsea installations incorporating use of ROV's; inspection, maintenance and repair services of offshore and subsea equipments, infrastructures and plants in the nature of pipelines, platforms and subsea structures, subsea packages and modules; pipeline, platform and subsea structures decommissioning