sentences:  As the chase progressed across thousands of nautical miles of ocean, "Southern Supporter" was joined by the South African salvage tug "John Ross" and polar icebreaker SAS "Agulhas" and Falkland Islands-based British fisheries patrol boat "Dorada".On 28 August, after , the contingent, led by Australian Customs Officer Steve Duffy, surrounded "Viarsa 1" south-west of Cape Town, South Africa.Meanwhile, a steaming party of Australian personnel flew to South Africa and boarded the oiler , which met the other ships on 3 September.