manuel gallegus reports from venice, louisiana. a huge concrete and steel dome could be the best answer. >> reporter: this 75-ton, concrete and steel dome is what british petroleum hopes will finally put an end to this. >> it will actually seal over the leak. and then we'll engineer piping that goes up to a barge. and we'll be able to funnel that oil that's escaping now. >> reporter: 50 miles off the coast. remote-controlled machines are leaking into the ocean floor. for replacement of the structure 5,000 feet below the oil surface. bp expects to start containing the oil flow thursday. saturday, it will begin pumping the oil to the surface. and we are hoping that it works. if it can stem 85% of this flow. >> reporter: as bp tries to control the leak, state and federal officials and local fishermen are racing to keep the oil from contaminating these vital mashlands and breeding -- marsh lands and breeding grounds. >> reporter: louisiana state governor bobby jindal says these will serve as staging platforms to absorb 25 miles of boom

manuel gallegus reports for wjz, with the latest on contaminant efforts from venice, louisiana. containment. >> reporter: this 75-ton, concrete and steel dome is what british petroleum hopes will finally put an end to the massive oil leak, now gushing about 200,000 gallons a day. >> it will seal over the leak. and then will engineer pipeing that goes up to a barge. and we'll be able to funnel that oil that is escaping now. >> reporter: 50 miles off the coast, remote-controlled machines are looking for replacement of the structure. bp expects to start containing the oil flow inside the dome thursday. saturday, it will begin pumping the oil to the surface. >> and we are hoping that it works. if it can stem 85% of its flow. >> reporter: as bp tries to control the leak, state and federal officials and local fishermen are racing to keep the oil from contaminating these vile marsh lands and breeding grounds. >>> local leader bobby jindal says boats like this one will serve as staging platforms in the gulf coast. >> you're looking at a stake in the ground, across an opening in the mars

it is arriving manuel gallegus reports for wjz, on the latest on containment efforts from lose lose. >>> -- louisiana. >> this 75-ton concrete and british dome is what they hope will put an end to the massive oil leak. now gushing about 200,000 gallons a day. >> it will actually seal over the leak. and then we'll engineer piping that goes up to a barge and we'll be able to funnel the oil that is escaping now. >> reporter: 50 miles off the coast, remote-controlled machines are preparing the ocean floor for the placement of the four-story structure. 5,000 feet below the oily surface. >> bp expects to start containing the flow. thursday. saturday, it will begin pumping the oil to the service. and -- several -- surface. and we are hoping that it will stem the flow. >> they are racing to contain the contamination. >> local leaders and louisiana governor bobby jindal say jack boat barges like this one, will serve as staging on the gulf. >> you look it. stake it in the ground, across an option in the marsh. and it will actually, the wave action will help the oil collect. >> ribbons of rust-