Independent: 23 days into their arduous journey across the frozen ice of the Arctic Ocean, the three polar explorers of the Catlin Arctic Survey are making the most of improved conditions to hasten their progress north. Pen Hadow, Martin Hartley and Ann Daniels embarked on their scientific survey to measure the state of the ice in late February, in the Arctic winter, in order to capture direct physical surface readings that is of particular interest to scientists researching what is happening to …