: The quest takes the family to unexplored underwater territories where they face escalating dangers while uncovering the history of the "Lemurians" and their technology. Series Production Details Episodes : Season 4 consists of 13 episodes .
The animated series (known in some regions as Grad or Dubina ) focuses its fourth season on a high-stakes quest involving the Nekton family's search for their long-lost grandparents. The Season 4 "Deep Story" Grad - 4. sezona
: The Nektons follow a global pattern involving a massive, fast-moving Nautilus creature. It is believed this creature holds a "key" necessary to restore balance to the world's oceans. : The quest takes the family to unexplored