Pentathlon and Decathlon are track and field events and organised by an athletic association, whereas Triathlon and Duathlon are organized by multi sport associations such as National Governing bodies for Triathlon and the ITU, International Triathlon Union. Adventure racing also takes place in Ireland. The majority of adventure races in Ireland fall into what's often called multisport, with run, cycle and kayak stages in events like WAR (Wicklow Adventure Race) and Gaelforce West, which are won in under 4 hours. There are also a few longer international-style adventure races lasting 24 hours and 36 hours, events like Beast of Ballyhoura and Cooley Raid. Tug of war Tug of war has been in Ireland for a long time and the creation of the Irish Tug of War Association in 1967 boosted the competition among clubs in Ireland and also enabled Ireland to compete in international events, such as the Tug of War International Federation (TWIF) World Championships. Underwater sports Ireland, being an island on the western edge of Europe and on the continental shelf, is well-suited for recreational diving activities such as scuba diving and snorkelling. The dive season in Ireland generally starts around March and ends around October. Recreational diving started in Ireland in the early 1950s with the founding of the Belfast Branch of the British Sub Aqua Club. In the early 1960s, diving clubs in the Republic of Ireland formed the Comhairle Fo-Thuinn (CFT) (English: Irish Underwater Council). This voluntary body regulates all aspects of diving for its members, is the national governing body recognised by the Irish Government and represents the Republic of Ireland at the Confédération Mondiale des Activités Subaquatiques (World Underwater Federation). The Northern Ireland Federation of Sub-Aqua Clubs which was formed in 1975 is the corresponding national governing body in Northern Ireland. As of October 2013, underwater hockey is the only underwater sport being practised. This activity is limited to the Republic of Ireland where regional competition takes place in both Dublin and Cork. Irish national teams have played internationally with attendance at European championships. Water sports Water sports practised in Ireland include canoeing, swimming, surfing, diving, water polo, sailing, and kayaking. Whilst many people participate in these, few do so competitively. Ireland has had only one Olympic medalist in swimming, Michelle Smith, and her medals have since been tarnished by drug allegations. The National Aquatic Centre was opened in Ireland in 2003 and