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8.2.11

Scientists have rediscovered what they claim is the eighth wonder of the world -- Pink and White Terraces in New Zealand, which were buried in mud for a 100 years, losing some charm.

Until the late 19th century, the Pink and White Terraces along Lake Rotomahana on the North Island, attracted tourists from around the world, interested in seeing beautiful natural formations created by a large geothermal system.

But the eruption of Mt Tarawera on June 10, 1886, buried the terraces in sediment and caused the lake basin to enlarge, engulfing the land where the terraces stood. For more than a century, people have speculated whether any part of the Pink and White Terraces survived the eruption.

Now, an international team has located portions of the long-lost Pink and White Terraces, using autonomous underwater vehicles (AUVs) to map the bottom of Lake Rotomahana.

Team leader Cornel de Ronde of GNS Science in New Zealand said the scientists were elated by the rediscovery.

"The first sidescan sonar image gave a hint of a terraced structure so we scanned the area twice more and we are now 95 per cent certain we are seeing the bottom two tiers of the Pink Terraces," de Ronde said.

Side-scan sonar and bathymetric data collected by two REMUS 100 AUVs clearly show crescent-shaped terraced structures in about 60 meters of water where the Pink Terraces were located prior to 1886; they are covered by a brownish lake sediment, say the scientists.

After detecting areas of interest with the AUV's sonar systems, the team used the underwater camera system to capture images of the lake floor where they were able to photograph some of the stepped terrace edges.

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