An oil-drilling ship capsized in the Gulf of Suez, killing at least four crewmen and leaving four others missing, authorities said Wednesday, Associated Press reported.

The drilling ship overturned Tuesday evening off the city of Ras Ghareb, on the African side of the Gulf of Suez, the Red Sea’s northwestern arm and a crucial shipping route, the Petroleum Ministry said in a statement.

There were 30 workers on board when the drilling ship capsized, said Amr Hanafy, governor of the Red Sea province.

Rescue teams recovered four bodies and rescued two 22 others who were taken to hospitals, he said, according to Associated Press.