`` Pollution containment chamber '' could reduce leak by more than 80 percent . Water pressure , greater than oil pressure , would help push the oil to the surface . Workers still putting together the 100-ton , 40-foot-tall rust brown device . Comment:
`` Pollution containment chamber '' could reduce leak by more than 80 percent . Water pressure , greater than oil pressure , would help push the oil to the surface . Workers still putting together the 100-ton , 40-foot-tall rust brown device . Containment chamber could be in place by end of the week , BP official says .