Swimming with the plesiosaur / Stone, Rex

Tom and Jamie discover a prehistoric paradise and decide to explore a cave where they can swim with ichthyosaurs--dolphin-like dinosaurs--but a hungry plesiosaur adds a deadly element to their snorkeling adventure.

"Tom and Jamie can't believe their luck when they find a secret entrance to a prehistoric world filled with dinosaurs. Loaded with snorkeling gear, the boys decide to explore the cove itself. But there are some not-so-friendly creatures lurking, including a hungry plesiosaur that wants a snack.

Tom and Jamie discover a prehistoric paradise and decide to explore a cave where they can swim with ichthyosaurs--dolphin-like dinosaurs--but a hungry plesiosaur adds a deadly element to their snorkeling adventure.