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Ocean-going scientist Helen Czerski is joined by underwater archaeologist Peter Campbell who leads a team which recently discovered an unprecedented 22 shipwrecks around a small Greek archipelago; conservation biology Professor Alex Rogers who says that the beautiful but fragile habitats in the depths of the high seas are under increasing threat from destructive deep-sea bottom trawling; and naval architect Oskar Levander who contends that automated and unmanned ships will dominate 21st century oceans. (Photo: Computer image map of an ancient shipwreck using rhinophoto 3D. Credit: Peter Campbell/ East Carolina University)