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It's been four years since the Deepwater Horizon disaster that killed 11 people and unleashed oil into the Gulf of Mexico for 87 days. Scientists dove to the Gulf floor for the first time since 2010 to determine how marine life is recovering.

It's been four years since the Deepwater Horizon disaster that killed 11 people and unleashed oil into the Gulf of Mexico for 87 days. Scientists dove to the Gulf floor for the first time since 2010 to determine how marine life is recovering. Chip Reid reports.

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