David Riaño, an environmental scientists at CSIC diagnosed with ALS (a neurodegenerative neuromuscular disease that results in the progressive loss of motor neurons that control voluntary muscles), decides to pursue his dream of traveling Eastern Europe to dive in its lakes. Adapting a van to sleep, eat and shelter in it, and with the help of Senegalese taxi driver Serigne Mbake and "tuno" Rubén Fuentes, David will search for meaning for his suffering doing what he likes most: traveling and floating in water.