In July 2005, Thunder Horse was evacuated in the face of Hurricane Dennis. After the hurricane passed, the platform was listing badly. The cause is still unknown — inspection teams found no hull damage — yet the event boosted world oil prices because of speculation of further oil shortages. The platform was fully righted about a week after Hurricane Dennis, but BP announced that commercial production had been delayed. The platform was struck almost directly by Hurricane Katrina six weeks later, but was not heavily damaged.
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