Subsea 7 has secured contract extension of three years with seven North Sea clients. Chevron, Dana Petroleum, Hess Denmark APS, Nexen Petroleum UK, Repsol Sinopec Resources UK, Shell and TAQA Bratani are the companies that have agreed on contract extension. Subsea 7 will continue providing diving support vessel services and also associated project management and engineering services for up to 50 offshore facilities of North Sea.