Coast Guard boats and aircraft have covered an area larger than the state of Rhode Island to search for 12 people still missing Wednesday off the Louisiana coast after their offshore oilfield vessel capsized in hurricane-force winds.

One worker’s body was recovered Wednesday and six people were rescued Tuesday after the Seacor Power overturned Tuesday afternoon in the Gulf of Mexico, the Coast Guard said.

The search, interrupted by darkness and bad weather, has totaled nearly 40 hours and more than 1,440 square miles (3,730 square kilometers) of Gulf waters by Wednesday afternoon, according to a news release. The hunt for the missing continued into the evening, said Petty Officer Carlos Galarza.