The U.S. Coast Guard confirmed Monday that four South Korean crew members are trapped inside an overturned cargo ship off the coast of Georgia, The Associated Press reported.

The Coast Guard reported rescuers made contact with the trapped crew after drilling through the hull of the ship and are trying to determine the safest way to remove them.

Lt. Lloyd Heflin told the AP the contact occurred Monday morning and the rescuers are struggling with language barriers when communicating with the South Korean crew members.

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“The early indication is they are on board and OK,” he said.

The cargo ship named Golden Ray was carrying more than 4,000 vehicles when it capsized in the St. Simons Sound about 2 a.m. Sunday and was enveloped in flames, the AP reported.

The Coast Guard reported Sunday that 20 of 24 crew members were rescued.

The fire inhibited rescue crews from fulfilling the mission to get to the other four crew members as they had to wait until it was stabilized.