evidence: ANNE RIMMER set sail from New Zealand for Tonga aboard a cruising yacht on May 5. In this, her first report, she reveals a place that few can visit and none can call home: the underwater land of Minerva Reef. [...] South Minerva Reef is a double atoll, looking, on the map, much like a pair of spectacles. This lagoon is eight miles across, and the fringe of white breakers effectively makes a horizon all around us. [...] Passage to Tonga: Minerva Reef