Offshore oil and gas exploration requires a constant support from offshore vessels in order to transport temporary drilling units and in fixing fixed units. After the temporary offshore drilling units have completed their jobs of initial oil / gas production, the site is replaced by permanent offshore oil / gas production structures or platforms. Gas production offshore. Industries | Oil and gas upstream Oil and gas exploration and extraction often takes place in extreme climatic conditions, including hot, dry desert, sand and salty atmospheres. Our equipment supports operations in remote and hard to access locations. Markets / Upstream / Offshore Oil & Gas Production Offshore Oil & Gas Production McDermott’s capabilities in the offshore market encompass the design, engineering, construction, installation, hook-up, start-up and commissioning of fixed and floating production facilities and subsea systems.