The U.S. Coast Guard Cutter Polar Star has returned to its home port in San Francisco after a rigorous 128-day deployment in Antarctica. This mission, part of Operation Deep Freeze 2025, marks the vessel's 28th journey to the continent in support of the U.S. National Science Foundation's management of the U.S. Antarctic Program, as reported by the Coast Guard News. The operation is essential for resupplying and maintaining the U.S. research stations in the region, ensuring the year-round continuation of critical scientific work.
Setting off from Seattle on November 22, 2024, the Polar Star covered an impressive 25,000 miles. The vessel journeyed through the North and South Pacific oceans before tackling the Southern Ocean's icy waters. The Coast Guard crew managed to navigate and break through 14 miles of ice skillfully, some sections reaching up to six feet thick, to open a path for cargo vessels and the HMNZS Aotearoa, enabling them to access the NSF McMurdo Station. "This crew continues to amaze me by how well they work together through every challenge," Capt. Jeff Rasnake, Polar Star's commanding officer, told the Coast Guard News.
Polar Star's mission was critical not only for supply replenishment but also for demonstrating the U.S.'s commitment to international cooperation under the Antarctic Treaty System. The icebreaker's capabilities are paramount for maintaining the infrastructure that enables scientific research and international partnerships in the unforgiving Antarctic climate. Additionally, during its deployment, the Polar Star engaged with the Commission for the Conservation of Antarctic Marine Living Resources to monitor fishing activities and other operations, safeguarding the sustainability of marine resources.
Before its return, the Polar Star stopped in French Polynesia, strengthening diplomatic ties and underscoring the U.S.'s vested interest in the Indo-Pacific. After completing Operation Deep Freeze '25, the icebreaker will transition to heavy depot maintenance as part of a five-year Service Life Extension Project awarded to Mare Island Dry Dock, LLC. This project is designed to update and maintain several systems aboard the cutter, extending its service life. "But our work isn't done," Rasnake stated, per the Coast Guard News. "As we wrap up ODF 25, we must quickly transition to the first phase of ODF 26 – heavy depot maintenance."
The Seattle-based Polar Star is the United States' sole heavy icebreaker capable of accessing both poles. Commissioned in 1976, the 399-foot cutter wields a combination of six diesel engines and three gas turbines, delivering a remarkable 75,000 horsepower to conquer thick polar ice. Its performance is a linchpin for the execution of next year's Operation Deep Freeze, which coincides with the ship's 50th anniversary since its commissioning.
