The Russian ship MV Akademik Shokalskiy, which has been on a research expedition to Antarctica, got stuck Tuesday after a blizzard's whipping winds pushed the sea ice around the ship, freezing it in place. The ship wasn't in danger of sinking, and there were ample supplies for the 74 scientists, tourists and crew on board, but the vessel couldn't move.
Maritime authorities received the ship's distress signal on Wednesday and sent three icebreakers to assist. By Friday afternoon, China's Snow Dragon had made it as far as the edge of the sea ice surrounding the ship, 20 kilometers (12 miles) away, but still faced the tough task of getting through the dense pack ice to the paralyzed vessel.
The Snow Dragon was hoping to reach the ship by Friday evening, but changing weather conditions and the thickness of the ice could slow its progress, said Andrea Hayward-Maher, spokeswoman for the Australian Maritime Safety Authority, which is coordinating the rescue.
Expedition leader Chris Turney said it may take the Snow Dragon until Saturday to break through.
"We're all just on tenterhooks at the moment, waiting to find out" how long it will take, Turney said by satellite phone. "Morale is really good."
The scientific team on board the vessel - which left New Zealand on Nov. 28 - had been recreating Australian explorer Douglas Mawson's century-old voyage to Antarctica when it became trapped. They plan to continue their expedition after they are freed, Turney said.
Passengers and crew have had to contend with blizzard conditions, including winds up to 70 kilometers per hour (40 miles per hour), but the weather had calmed considerably by Friday, Turney said.
"The blizzard we had yesterday was quite extraordinary - it's not nice when you can feel the ship shaking," he said.
Despite the interruption to the expedition, the scientists have continued their research while stuck, counting birds in the area and drilling through the ice surrounding the ship to photograph sea life.