Six were rescued after the liftboat capsized on Tuesday 8 miles south of Port Fourchon and the US Coast Guard (USCG) said it had since recovered one more person who was unresponsive.
Search and rescue efforts continue to locate 12 more crew members who are missing.
“Our rescue crews have been diligently continuing the search and rescue efforts for the missing people from the capsized vessel,” said Capt. Will Watson, commander of Coast Guard Sector New Orleans.
“When it comes to search and rescue, each case is dynamic and no single case is the same as the next. Anytime our Coast Guard crews head out for search and rescue, it is always our hope to safely bring those people back and reunite them with their friends and families.”
Coast Guard rescue crews have searched more than 1,440 sq miles in a 40-hour period.