In August 2003, the Australian Customs vessel Southern Supporter spotted the Uruguayan-flagged longliner MV Viarsa 1 fishing illegally for Patagonian toothfish near Heard Island in the remote sub-Antarctic. When ordered to stop for inspection, the Viarsa 1 fled, initiating an epic 21-day, 3,900-nautical-mile hot pursuit through roaring ocean swells and dangerous pack ice. Exercising the doctrine of hot pursuit under Article 111 of the United Nations Convention on the Law of the Sea (UNCLOS), Australian authorities refused to let the suspect vessel escape into international waters.
The chase tested the physical limits of both crews as temperatures plummeted and giant sea ice threatened to crush the vessels. Realizing they needed assistance across vast oceanic stretches, Australia coordinated an unprecedented international law enforcement response involving South African icebreaker SA Agulhas and British fishery patrol vessel FPB Southern Ranger. As the Viarsa 1 tried to push through dense pack ice off the coast of South Africa, the combined international fleet closed in.
Trapped by ice, the captain of the Viarsa 1 finally surrendered. The vessel was boarded, seized, and escorted all the way to Fremantle, Western Australia. This historic chase established a massive legal precedent for global cooperation in enforcing maritime law and protecting vulnerable marine species in remote international waters.