A new marine navigation chart survey of the waters of Ha‘apai and Nuku‘alofa, has discovered uncharted marine volcanoes that are big enough to sink a cruise ship. Tonga's marine charts, among the oldest still in use, are being updated using airborne laser, metric sonar and an unmanned submarine- enhancing Captain Cook's fathoms measurements made by ropes in the 18th century. By Eleanor Gee.
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Friday 14 December 2018
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Nuku'alofa, Tonga
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