Most important thing is to remain or become calm. Do not panic. Try to assess the seriousness of your emergency. If you can send a sms to the Organisers Emergency Number (OEN) with your BIB and relevant information, then do so and wait for a reply and further instructions. If the emergency doesn't require immediate intervention, attract the attention of one of your fellow runners. If you are facing a serious emergency, you can't reach the race organisers nor one of your peers, call the 112 emergency services. Use your phone to obtain the GPS coordinates of your actual location and provide all necessary details of your emergency to the organisers or emergency services.