1,083 kilometre long "swimming pool"
The 1,083-kilometre "swimming pool" stretched from the source of the Elbe, or Smirice in the Czech Giant Mountains, to the mouth of the Elbe in Cuxhaven. Professor Andreas Fath reached his destination after just 25 days and an average of 46 kilometres and eight hours of swimming per day. Along the way, he and his team took daily water samples, which were scientifically analysed for things such as microplastic content. The wetsuit he wore in the water was also particularly interesting as it had a filter membrane attached to it that imitated fish skin and provided additional information on water quality.