An acoustic doppler current profiler is suspended under the ice to measure currents from the surface to the seabed near Scott Base. Photos: Peter Marriott : Biodiversity abounds in frigid waters

The soft coral Gersemia antarctica stands tall, filtering the current for any passing food. : Biodiversity abounds in frigid waters

Large anemones Isotealia antarctica, nestled among the anchor ice, wait for passing jellyfish, urchins and starfish. : Biodiversity abounds in frigid waters

Niwa specialist diver Leigh Tait breathes from a nitrox tank at the end of his dive, one of many extra safety precautions used for diving under the Antarctic ice. : Biodiversity abounds in frigid waters