Marine Facility

The Jurassic Park Aquarium is an upcoming building slated to appear in Jurassic Park: The Game. It will contain a yet-to-be announced marine reptile, and possibly others. This would mean that InGen has recreated more dinosaurs than they ever told the group (such as Troodon, Pteranodon, Spinosaurus). It was never mentioned in the novels nor movies.

Exhibits/Animals
No one knows for sure which animals shall appear, but in Jurassic Park III: Park Builder, there were some marine reptiles available to feature, which could mean one of them could appear. The animals could be:
 * Plesiosaurus
 * Elasmosaurus
 * Kronosaurus
 * Eurhinosaurus

And several others.

Trivia

 * It can be assumed that the aquarium was a secret project that Hammond, nor the rest of the staff, were supposed to tell anyone about, or it could be another secret InGen project, like the aforementioned secret dinosaurs.