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Underwater video showing the leak. the company says it spent $450 million responding to the massive spill. and now bp is ready to try its next attempt to plug up that leak. this with a two-ton containment dome called a top hat. it s made its way to the sea floor, and it s being positioned to sit on top of that leak. well, nbc s tom trong joins us live from dauphin island, alabama. tom, can you explain to us what this smaller dome is? this is really a plan b, right? reporter: it certainly is, lynn. the top hat s going to be a smaller, concentrated dome. the first dome failed because it was a large coffer dam. once it was over the leak point, once it was over there, it was foaming up. what was happening was, because of the methane gas, also the ice crystals forming, it was pushing that dam up towards the surface. this smaller top hat now is going to have a tube running down into it. ....