The black swim is an event running in the hours of darkness which took place on Friday the 20th June from sunset (9.30)to sunrise (4.30) on the 21st June with 4/5 elite participants. The swim started at Mapledurham Lock and went through Reading and finished in Henley. Each participant will be supported by a kayaker and will be without a wetsuit. The victor will be the one who has travelled the furthest along the course before sunrise / 4.30am. Along with Racemap.de in8 sponsorted the tracking system for the event and supported from start to finish. http://henleyswim.com/events/blackswim/