5 Deadly Prehistoric Sea Monsters Unexplained Mysteries

Check Out These 5 Deadly Prehistoric Sea Monsters. The modern ocean is a scary place, However, no matter what we find in the depths these days, none of them will come close to the giant terrors that roamed the seas in Earth’s past. So here are 5 deadly prehistoric monsters that once lived.

Number 5 - Helicoprion

Number 4 - Thalassomedon

Number 3 - Livyatan

Number 2 - Mosasaurus

Number 1 - Megalodon