The Miocene has the Megalodon (obviously), Livyatan, Acrophyseter, Piscogavialis, and the Gryposuchus which are a fine bunch of powerful and fearsome predators that are just as intimidating if not more so than the ones of the Cretaceous, Devonian, and Jurassic. The only reason I think the Cretaceous was the most dangerous in the original was because of the amount of predators inhabiting those waters but even then the Miocene is still a really good contender for the name Hell's Aquarium. It really wouldn't have mattered if you didn't include them at all but it did make it seem more dangerous than the Cretaceous sea for sure. You have whales and crocodiles as well, I certainly would have adored seeing some of those in this one and it kind of weird not to have some of the hazards in since every other segment had each of it's hazards in its segment even if it was only briefly.
I see you included in the Hazards segment in addition to the Megalodon. Alright then here we are at the final segment of Sea Monsters the Miocene, the build up at the end of the Cretaceous segment was really cool as all you could see was that massive dorsal fin piercing through the surface.
