Contestants are seen swimming in the sea during an Ironman 70.3 contest at Dun Laoghaire, a seaside town in Dublin, Ireland, Aug. 19, 2018. Ironman 70.3, an athletic contest consisting of swimming, cycling and long-distance running which cover a total distance of 70.3 miles or 113 km, was held here on Sunday, attracting thousands of participants from home and abroad. (Xinhua)