Helix Energy Solutions Group, Inc., together with its subsidiaries, operates as an offshore energy company. It provides reservoir development solutions and other contracting services to the energy market, as well as to its oil and gas properties. The company offers various contracting services in the Gulf of Mexico, North Sea, the Asia Pacific, and west Africa regions primarily in deepwater. Its development services include installation of subsea pipelines, flowlines, control umbilicals, manifold assemblies, and risers; pipelay and burial; installation and tie-in of riser, and manifold assembly; commissioning, testing, and inspection; and cable and umbilical lay, and connection. The company also offers various production services comprising inspection, repair, and maintenance of production structures, risers, pipelines, and subsea equipment; well intervention; life of field support; and intervention engineering. In addition, it provides reclamation services, such as reclamation and remediation services; plugging and abandonment services; platform salvage and removal services; pipeline abandonment services; and site inspections. Further, the company offers oil and natural gas processing services to oil and natural gas companies. Additionally, it engages in the prospect generation, exploration, development, and production of oil and gas properties located in the Gulf of Mexico. As of December 31, 2011, its estimated proved reserves totaled approximately 38.9 million barrels of oil equivalent. Helix Energy Solutions Group, Inc. provides its products and services to oil and gas companies, oil and gas pipeline companies, and independent oil and gas producers and suppliers. The company was formerly known as Cal Dive International, Inc. and changed its name to Helix Energy Solutions Group, Inc. in March 2006. Helix Energy Solutions Group, Inc. was incorporated in 1979 and is headquartered in Houston, Texas.