The second of two voyages of the R/V Tangaroa to study the oceanography of the Macquarie Ridge. The voyage represented a collaboration between scientists and projects at NIWA and CSIRO Division of Marine and Atmospheric Research, the Antarctic Climate and Ecosystems Cooperative Research Centre (ACECRC), and the Research School of Earth Sciences, Australian National University (ANU) in Australia, and the Geological Nuclear Sciences Institute (GNS) in New Zealand. Voyage objectives: 1. Retrieve moorings deployed in 2007 in the gaps in the Macquarie Ridge 2. Undertake a physical oceanographic survey of the Macquarie Ridge 3. Collect sediment cores along the axis of the Macquarie Ridge and in the Emerald Basin 4. Survey the biodiversity and habitat of seamounts associated with the Macquarie Ridge 5. Deploy Argo floats