Helix Energy Solutions ( HLX) provides underwater construction, maintenance and salvage services to the offshore natural gas and oil industry in the Gulf of Mexico. This company's shares could rocket if the government decides to expedite the permitting process for new projects in the Gulf. It slowed the process due to an environmental review of oil production there after the BP ( BP) oil spill in April 2010. It works on offshore infrastructure construction projects involving pipelines, production platforms and subsea production systems. The company's shares are up 35% this year and 62% over the past 12 months, giving it a market value of $1.8 billion. But over the past five years, its shares have declined 15%, on average, annually.