Dome Operation News Today

>> it could be a turning point in the gulf. crews begin lowering a containment dome over a leaking well. when the next 72 hours, we should know if the underwater experiment should work. they are hoping the dome will be able to capture and funnel the leaking oil to a waiting tanker above. david mattingly is live in venice. we know this dome operation is something theyve never tried before. give us an update on how its going today? >> reporter: so far so good. the dome is in place, they are loweri...