reporters while there are no guarantees, the dome could have the spill under control by early next week. reporter: contessa, a lot of the elements here around this oil spill, oil leak is very imprecise. that s why a lot of the officials with bp especially have been hesitant to give out estimates. for now bp is expecting to move what they re calling a 65-ton coffer dam into place over the major leak in about six days. they re hoping to have that in place within six day. it s basically a 65-ton concrete and steel surface dome that will go over this major leak and then it will have a pipe running up to the top to a boat. they ll pump the oil from there, that way it controls and contains the oil coming from the sea floor. meantime, the efforts to boom and contain this spill are