Prince Albert of Monaco has become the first head of state in the world to visit the North Pole. The 48-year-old prince endured far-from-royal rations in the first four days of the trip.“Today was a very difficult day. There were a lot of tricky passages, pack ice, and we had to find our way through the leads and the icy water,” he said. The group, which included the prince’s personal doctor and the British mountain climber Annabelle Bond, landed at the Russian supply base of Barneo on Thursday morning. They used dog sleds to cross the 150 kilometres of pack ice leading to the Pole and arrived early on Sunday afternoon. The prince was following in the tradition of his ancestor, Prince Albert, who went on four expeditions in the Arctic between 1898-1907. The expedition is aimed at raising awareness of the ecological problems caused by global warming. The negative side-effects are first felt in the Polar regions.