After the Deepwater Horizon accident a capping stack like this one had to be built to stop the flow of oil. Now, five of them are on standby in Corpus Christi, Texas, and could be deployed in about a week.

After the Deepwater Horizon accident a capping stack like this one had to be built to stop the flow of oil. Now, five of them are on standby in Corpus Christi, Texas, and could be deployed in about a week.