It's twice the size of a T rex.

Its jaws are big enough to crush cars, and it can swallow multiple humans at a time.

This'll ancient beast is called a mega Ladan shark, and if it had never become extinct, it would have a surprisingly large impact on our lives.

How would it change the way we use our oceans?

How big of a threat would oppose to people?

And what are the chances that these creatures have been hiding deep in our oceans all this time?

This'll is what if?

And here's what would happen if mega Ladan sharks had never become extinct.

Over the years, reports of mega Ladan sightings have emerged all over the Internet.

A lot of them claim that these giant sharks never went extinct, that they've just been hiding in the deepest part of the ocean.

The Mariana Trench.

Now you can't dive down there to check for yourself, but scientists say there's more than enough evidence to debunk these online accounts.

If Meg Alauddin sharks were still around, we definitely know about it by now.

our oceans would be a lot more dangerous.

Here's how we know that Mega Ladan Sharks haven't been hiding from us this whole time.

For starters, if Meg Ladan sharks still roamed our oceans, the last place they'd be going would be the Mariana Trench Megillah.

Dons were warm water mammals, so the frigid temperatures of the Mariana Trench would make it impossible for them to survive there.

Plus, if these enormous sharks still existed, we'd be finding their signature giant bite marks on other large Marine animals.

We'd also most likely have found at least one carcass or skeleton by now.

But that hasn't happened.

The only remnants we found of these prehistoric monsters are their teeth, and we found a lot of them.

The reason Megalodon teeth are so easy to find is because they produced a ton of them.

Unlike humans who only produced teeth during the early stages of life, sharks continued to produce new sets throughout their entire lives, losing their teeth almost every two weeks.

Their teeth would sink down to the bottom of the ocean, where they would likely be fossilized.

Most megatons would go through about 40,000 teeth in their lifetime That's a lot of remains for us to discover.

But because we've never found an intact Magadan, there's still a lot we don't know about.

Here's what we've been able to find out so far.

Mega Ladan Sharksfirst showed up about 16 million years ago, and they were a dominant predator in the ocean, measuring anywhere between 10 to 18 meters.

These giant beasts preyed upon anything from fish to dolphins and even whales.

Then, about two million years ago, they disappeared off the face of the earth, and scientists aren't exactly sure why.

One theory is that they became extinct due to decreasing food sources and increasing competition for that food.

Another more intriguing theory is that Meg Aladdin's simply couldn't adapt to the cooling ocean temperatures and that their prey kept moving to colder waters to escape them.

Regardless of the reason behind their extinction, you can't help but imagine how different our oceans would be today if they had survived.

It's estimated that a mega Ladan eight, about 1100 kilograms of food each day if they were still around and eating that much, then they're barely being a large fish left in the ocean for us and that wouldn't be the only problem for the fishing industry.

We could also see Mega Logan's tracking fishing boats and stealing the fish they catch, just like some killer whales do.

With ocean temperatures warming up again, megatons would be thriving and reproducing, resulting in even more of these giant mammals in the water.

That would spell trouble for maritime shipping operations, cruise ships and even beachgoers.

Megatons gave birth in warm, shallow waters, so a nice recreational beach swim could become very dangerous for us.

What would our planet look like if no animals went extinct?

Maybe one day we'll be able to bring old species back and find out.

But that's a story for another.

What if?