Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Latest Effort to Contain Gulf Oil Spill Under Way VOA News 15 May 2010 Members of the Louisiana National Guard build a levee to protect inland waterways from oil spill on Elmer's Island in Grand Isle, La., 14 May 2010 Photo: AP Members of the Louisiana National Guard build a levee to protect inland waterways from oil spill on Elmer's Island in Grand Isle, La., 14 May 2010 Engineers from oil giant BP are making their latest effort to contain the massive oil spill in the Gulf of Mexico. Workers were trying Saturday to plug a leaking underwater pipe with a tube that could pump oil to a ship above. BP has failed at previous efforts to contain the well gushing hundreds of thousands of liters of oil per day. Various experts say the amount of oil spewing into the gulf is much higher than initial estimates. Several U.S. government agencies are working to protect the southern U.S. coast as the oil slick created by the spill approaches. Workers have set up floating barriers and sprayed special chemicals to break up the massive oil slick. U.S. President Barack Obama has ordered a full review of the federal agency that oversees oil drilling. He says he will end what he called the "cozy relationship" between the Mineral Management Service and oil companies. A U.S.-based environmental group called the Center for Biological Diversity says it is suing U.S. Interior Secretary Ken Salazar. The group says the Mineral Management Service, which Salazar oversees, improperly approved oil drilling projects including the one that led to the current crisis. Estimates for the amount of oil spilled since a BP rig exploded on April 20 widely vary. Based on initial estimates by the U.S. government, the current volume is almost 20 million liters. But The New York Times says in a closed-door meeting earlier this month, a BP executive gave U.S. congressmen "worst case scenario" figures that would put the oil slick's current size at more than 200 million liters. Some information for this report was provided by AFP, AP and Reuters. .