Someone just stole the rarest tortoise in the world and the Nektons are searching for it. But the man who stole it secretly wants to capture them too! They're walking into a trap, but really, there's no other way.

To find a piece of the mysterious Ephemychron, the Nektons have to fight off whirlpools, zero visibility and giant robotic jellyfish! Is Nereus doing this to them? If not, who is really behind all these obstacles?