(CNN) - A fourth crew member who was trapped aboard a cargo ship that capsized off the Georgia coast has been rescued, the US Coast Guard said Monday. Three crew members were rescued earlier Monday, the Coast Guard said.
Three of the four remaining crew members who were trapped aboard a cargo ship that capsized off the Georgia coast were rescued on Monday, the US Coast Guard said.
The rescued crew members were located in one part of the Golden Ray cargo ship. The fourth crew member is trapped behind glass in an engineering control room, Coast Guard Capt. John Reed said. Officials are working to rescue the crew member, who has not had fresh food and water since the ship capsized early Sunday, Reed said.
"This is a dynamic situation," Reed said of the rescue. "It's outstanding news, and it continued to change throughout the day."
Reed said the rescued crew members are receiving medical attention. Two of the crew members are in stable condition at Southeast Georgia Health System in Brunswick, Jenni Morris, a hospital spokeswoman, told CNN. It wasn't immediately clear where the third crew member was being treated.
The Coast Guard has been working since early Sunday to rescue the four South Korean crew members that were unable to get off the ship when it tipped onto its side in St. Simons Sound. The size of the 656-foot ship and the fact it has watertight doors, several compartments and no power complicated the rescue, Petty Officer 1st Class Luke Clayton said.
A salvage team made contact Monday morning with the trapped crew members, Coast Guard Lt. j.g. Phillip VanderWeit said earlier in the day.
A team overnight heard tapping sounds from the propeller shaft area, he said. Rescuers were dropped off via helicopter and drilled a small hole in the ship to communicate with the crew members, VanderWeit said.
Video showed rescuers walking along the ship's hull, assessing it for "possible entry," the Coast Guard said earlier.
A call for help
The first dispatches from the ship came at around 2 a.m. Sunday, VanderWeit said.
South Korea's Foreign Ministry said the ship began "listing heavily," about 80 degrees, to the port side before overturning. Help arrived about two hours after the first call came in, VanderWeit said.
Twenty members of the crew were rescued around 4 and 5 a.m., VanderWeit said. They exited via various parts of the vessel, which posed a challenge in getting them off the ship.
Some crew members were hoisted onto helicopters while others were lowered -- in some cases by fire hoses -- onto boats, VanderWeit said.
Fires broke out on the ship, preventing rescuers from continuing their efforts to save the remaining four crew members, said Capt. John Reed, commander of the Coast Guard Sector Charleston.
"As smoke and flames began to appear our crews, along with the Glynn County heavy rescue team, assessed that the situation was too risky to further go inside the vessel to attempt to locate the four individuals who remain missing at this time," Reed said.
The Coast Guard remained on the scene, trying to stabilize the ship, and they continued to search the waters surrounding the vessel, VanderWeit said.
The ship, sailing under the flag of the Marshall Islands, was bound for Baltimore, where it was expected to arrive Monday, according to MarineTraffic.com. A longshorewoman told CNN the ship was carrying automobiles.
Crew members given food and clothing
Those who were rescued were given aid by the International Seafarers' Center in Brunswick, said Vicki West, the center's director.
Her organization provided food and clothing to between 18 and 20 crew members, all of them Filipino and South Korean, she said in an email.
They were in good condition, she said.
Volunteers from her organization served them lunch and helped those who wanted to attend Mass at St. Francis Xavier Catholic Church.
The crew members received bags with hygiene items, socks, toothpaste and games, some of which were donated to the center by the community, West said. They also gave Bibles and promise books to the crew members, she said.
Officials are still trying to determine what caused the ship to overturn.
Two investigators from the National Transportation Safety Board, which is supporting the Coast Guard investigation, were expected to arrive on the scene Monday, according to NTSB spokesman Keith Holloway.
South Korea's Foreign Ministry sent a consul from Atlanta to the scene to determine the status of the rescue and provide consular assistance to those who were rescued.
The cargo ship, owned by cargo logistics company Hyundai Glovis, carries vehicles and had just been unloaded and reloaded by longshoremen at the Port of Brunswick in the hours before it began leaning, a longshorewoman told CNN. The loading process went smoothly, and nothing seemed out of the ordinary, she said.
Hyundai Glovis has not returned CNN's calls for comment.
After the last crew member is rescued and the ship is stabilized, salvage crews will find the best way to remove the ship without creating an environmental incident, the Coast Guard's Clayton said. There is no sign any pollutants have entered the water, he said early Monday.
Though no pollution has been detected, officials with the Coastal Georgia Public Health issued a precautionary swimming advisory for St. Simons and Jekyll Island beaches and said the Coastal Resources Division of Georgia Department of Natural Resources will conduct water quality sampling to ensure the safety of shellfish harvesting beds and swimming beaches.
CNN's Eliott C. McLaughlin, Tina Burnside, Amanda Jackson, Sarah Faidell, Dakin Andone and Melissa Alonso contributed to this report.
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