Subsea7 is a multinational company based in Luxembourg, specializing in subsea engineering and construction for the offshore energy industry. With its operational headquarters in London, UK, Subsea7 was founded in 2002 through a joint venture and has since grown through mergers, including a notable merger with Acergy S.A. in 2011.

The company delivers a range of services, including engineering, project management, supply chain, and vessel management. Subsea7 focuses on connecting seabed structures to surface facilities and provides integrated solutions for the installation, inspection, maintenance, and repair of offshore infrastructure. In addition to oil and gas, Subsea7 is involved in the energy transition, supporting offshore wind projects and decommissioning redundant facilities. The company operates globally, with a customer base that spans multiple regions, including the UK, Norway, the US, and Brazil, among others.