The maintenance costs for offshore exploration are increasing due to corrosion problems. Another engineering challenge is the fact that offshore installations are increasing in size and weight. In view of this perspective, replacing metals by lighter materials is a constant concern in the industry. Polymeric composites, particularly those reinforced with carbon and glass fibers, offer good corrosion protection, low density and excellent rigidity and strength. Due to these properties, composite materials have great potential to replace metal structures. A major challenge is to develop composites to withstand the demands of the harsh offshore environment, such as fire hazard, accelerated aging, moisture, structural durability, among others. These characteristics can be enhanced by incorporating carbon nanotubes (CNTs) or graphene in adequate concentrations to produce multifunctional materials that combine structural and non-structural functions.