once onsite, the box will be lowered to a depth of 5,000 feet over the largest leak.. if it works, oil will be siphoned to ships nearly a mile above. >> so if all goes to plan, we should begin to start that operation, the beginning of trying to process the fluids on the surface and stop the spill into the sea, on monday. >> reporter: earlier today, robotic submersibles shut off another leak, but it was not considered a significant source of the flow. conservative estimates are that 210,000 gallons of oil are leaking each day. but b.p. executives, responsible for the spill and cleanup, have told congress that a worst-case scenario could mean 2.5 million gallons a day could spill if the leaks are not controlled. meantime, on shore, an 8,000-man army is being assembled to contain the spill and clean up whatever makes landfall. louisiana governor bobby jindal. >> today, you see this jack-up barge, this jack-up barge will be leaving today with absorbent booms. you're going to see commercial fishermen, you're going to see louisianians, who know this area better than others,