The Sava River is residence to an apex underwater predator, the Huchen, or Danube Salmon. When the Huchen is prospering, the entire ecosystem is wholesome. With goggles and snorkels in tow, this crew of strange kayak-activists-turned-river-snorkelers dives deep to higher perceive the situation of this freshwater world. This video is delivered to you by Balkan River Defence. Shot on location on Slovenia’s longest river: The Sava.