Indonesian rescuers are battling strong currents on Friday as they resume the search for 30 people still missing at sea about 35 hours after a ferry sank killing at least six people, officials said.

Indonesian rescuers were searching for 29 people who remained missing Thursday after a ferry sank and six people died the previous night near Indonesia’s resort island of Bali.

Indonesian rescuers raced to find victims in rough seas on Thursday after five people died and dozens were left missing when a ferry carrying 65 people sank near the island of Bali, according to search and rescue agencies.