NEW : Obama also says U.S. will seek full compensation for all damages from BP . The `` top-hat '' cofferdam , a 5-foot-tall , 4-foot-diameter structure , weighs less than 2 tons . `` Top-hat '' containment device reaches Gulf floor . New device would allow engineers to pump in methanol and keep hydrates from forming . The new device is expected to be deployed by the end of this week, but it could take up to a month before it's ready to go into action. Success of latest attempt could be known in next few days .
NEW : Obama also says U.S. will seek full compensation for all damages from BP . `` Top-hat '' containment device reaches Gulf floor . New device would allow engineers to pump in methanol and keep hydrates from forming . The new device is expected to be deployed by the end of this week, but it could take up to a month before it's ready to go into action. Success of latest attempt could be known in next few days .