Description:Eleven oil workers held hostage by rebels in Colombia since late February are tasting freedom once more after their release. They were seized by ELN guerrillas as they travelled by bus to a pipeline. The kidnapping was the latest in a series of such incidents threatening to damage Colombia's oil industry. Dozens of oil sector workers have been kidnapped since the start of 2011. Most were abducted by ELN or FARC rebels and later released.(0:56)