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.

The offshore drilling industry now has equipment on standby to respond to a similar emergency. But critics says stronger regulation is still needed to prevent another massive oil spill.

(Image credit: Jeff Brady/NPR)

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