Climbers walk along the arch of the Sydney Harbour Bridge behind the Sydney Opera House on May 30, 2014, as they attempt to break the record for the most number of people on the arch of the famous bridge at the same time. The former record of 316 people, set in 2011, was broken when 340 people reached the top of the bridge on Friday during a charity event raising money for polio research. [Photo/CFP]