
Polar Star, the U.S. Coast Guard icebreaker, is seen in a handout photo taken in Antarctica April 4, 1999.
The Polar Star is responding to a request for assistance from Australian authorities as well as from the Russian and Chinese governments, it said in a statement.
"The U.S. Coast Guard stands ready to respond to Australia's request," Coast Guard Pacific Area Commander Vice Admiral Paul Zukunft said. "Our highest priority is safety of life at sea, which is why we are assisting in breaking a navigational path for both of these vessels."
A Chinese icebreaker that helped rescue 52 passengers from a Russian ship stranded in Antarctic ice found itself stuck in heavy ice on Friday.
The Snow Dragon ferried the passengers from the stranded Russian ship to an Australian icebreaker late on Thursday. It now had concerns about its own ability to move through heavy ice, the Australian Maritime Safety Authority said.
The Russian-owned research ship left New Zealand on November 28 to commemorate the 100th anniversary of an Antarctic journey led by Australian explorer Douglas Mawson.