Workers walk along a line of barges anchored in Pass Abel on the coast of Louisiana near Grand Isle, La., Monday, June 21, 2010. When completed, the barges, which will be lined up end-to-end, are expected to serve as a barrier against oil from the Deepwater Horizon oil spill from entering Barataria Bay. (AP Photo/Patrick Semansky)

Photo by: Patrick Semansky

Workers walk along a line of barges anchored in Pass Abel on the coast of Louisiana near Grand Isle, La., Monday, June 21, 2010. When completed, the barges, which will be lined up end-to-end, are expected to serve as a barrier against oil from the Deepwater Horizon oil spill from entering Barataria Bay. (AP Photo/Patrick Semansky)