Twilight and Spike were only meant to explore the entry hall to a sunken temple, as their swim in the huge jungle seas turns real south when a huge, angry shark gets involved. The territorial beast chases the pony and dragon inside the temple and the only way to evade the beast is to explore the winding depths.

Nevertheless, Twilight grabs Spike and plunges into the unknown, their escape pushing them to their absolute limits as the mysteries of the sunken temple will soon be revealed to them...