It's possible that it's still alive down there somewhere.

I think they could exist but they have most likely evolved into something greater or they could of shrunk in size(not to much though) my opinion that would be awesome if they still did exist today

I believe it could still exist. As previously stated, it is estimated that we've only discovered 5% of sea animals and roughly 10% of land species, so anything is possible.

I still believe the Megalodon could exist. Maybe there was one Megalodon that had a mutation, and it could adapt to colder temperatures? Would be crazy to have a living megalodon.

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I believe they exist, but I believe they also dwell in the deeper reaches of the Marriana's trench or an area somewhat like it. We have explored a ridiculously small percentage of the oceans on Earth. It is certainly possible.

I hope it's something like primeval that would be pretty cool.

As most people have said, it's hard to tell whether or not it exist, or even something bigger. We've explored so little of our oceans, who knows what's down there.

Maybe it just was sick and had a high tempature:)

it would be pretty awesome if they still existed. I would go see one someday

That kind of stuff is just creepy! The oceans are so mysterious