Workers set up an oil rig near the coast on the outskirts of Havana May 24, 2010. Cuba estimates it has 20 billion barrels of oil in its part of the Gulf of Mexico, which abuts the oil-rich U.S. and Mexican zones of the gulf, and Havana views its possible production as a godsend. The communist-led island produces about half its energy needs from onshore wells and gets the rest from oil-rich socialist ally Venezuela at favorable prices. REUTERS/Desmond Boylan (CUBA - Tags: ENVIRONMENT ENERGY DISASTER BUSINESS)