Defo diving with a mosasaur

Livyatans probably would probably be just as docile to humans as modern sperm whales

Ordovician would probably be safer

But I wanna see Liopleurodon

Sure you wouldn't rather see Predator X, who's actually super big? And Ordovician would only be safe creature-wise. The atmosphere may be toxic and such.

I would rather see predator x then cymbospondylus, what people don’t realize is how huge cymbo is

^ Yeah, like I said above. Cymbospondylus is truly enormous - Sea Monsters didn't overestimate like with Liopleurodon (in fact it may even be a juvenile?).

Yeah

Predator x when its far planet dinosaur sized

Truthfully I’d choose none of these since every one of these seas are full of deadly predators that would clamp their jaws down on humans just to learn what they taste like. If I was forced to choose though I’d say Ordovician as I’d suffocate from the toxic air well before I’d get eaten by the Nautiloids and Sea Scorpions

A freaken ichthyosaur from the triassic that was thought to be kinda small was longer than predator X