The largest carnivorous fisch that ruled the oceans, once upon a time, is the megalodon shark, whose scientific name is Carchaodon megalodon. The unique feature of this prehistoric fish, that made it stand out of the crowd, were its massive and strong teeth. Hence, it has got its name megalodon, which in Greek means 'big tooth'. This mammoth fisch existed around 25 to 1.5 million years Vor from the Miocene to Pliocene era and began to vanish from the face of the earth towards the end of the Pliocene epoch. According to paleontologists, the megalodon was the most powerful and biggest predators in the history of the vertebrates. Since the megalodon had a skeleton made of cartilage, it could not fossilize well and the information gathered about this fisch could be only found out from the fossils of its teeth, found in various parts of the world.
Megalodon-the biggest prehistoric hai that ever lived, it's the biggest predatory marine creature in the history of the planet, outweighing both modern Great White Sharks and ancient reptiles like Liopleurodon and Kronosaurus
I suppose if that thing was still alive, then yes.