So far, in their mission of diving in 7 of the deadliest seas of all time. Twilight and her friends only dived in 2 prehistoric oceans, but ahead lie 2 of the most dangerous. Inhabited by the nastiest collection of predators, that Nature has yet assmebled.

6th

Most Deadly Sea Of All Time

Name: The Triassic

When: 230 Million Years Ago

Hazards: Nothosaurs, Cymbospondylus

Twilight and her friends have arrived at their new destination, The Mid Triassic.

Wow! It's nice here. Rarity said looking at the view of the beach their on.

I'm dying to head out the ocean. Said Rainbow.

Twilight made a boat appear and it's in the water. There we are!

They climbed onto the boat and set sail. But unaware what lurks beneath the waves.

The Triassic is a amazing time for Marine Life. Something's new has happen. The fish, or the Mammals, their not the most ferocious animals out there. This sea is dominated by a group that use to just live on the land.

The Reptiles.

Reptiles dominate everywhere right now. Winged Reptiles, the Pterosaurs rule the skies. And the future lords of the land, the Dinosaurs have just evolved.

But there not much to look at yet.

That will be another chapter.

Of course they were here to explore life in the sea. Home to the largest Triassic reptiles of them all.

Fortunately, sea reptiles are easy enough to spot. Because they have to come up for air.

As Twilight and the others relax on the boat. Fluttershy notice something at the surface of the water.

Hey guys, look at that! She called.

The others quickly saw the marine animal and soon it went underwater.

What was that? Spike said wondering.

We're about to find out. Twilight said.

Their sighting was a Nothosaur.

Twilight, Fluttershy, Starlight, and Spike were about to head into the water. The Nothosaurs they can be a bit nippy. But there's bigger reptiles down there, that could easily kill a pony. So Twilight and Starlight will ready to zap them, incase they come too close.

And soon they jumped into the water.

And soon they saw the reptile. But there's not just 1 Nothosaur, there's a pair of them. And their coming closer and closer, but their just curious. But they are the first ponies and dragon they've seen.

It's unclear how they'll they'll react, but Twilight and Starlight ready if things get hairy. But at the moment, their just curious circling around them. Twilight and the others notice they have a mouthful of teeth like razors. It's the perfect fish trap for them, and they certainly move fast enough to catch the fish that live here.

And soon the 2 Nothosaurs left them, and as they explored the reef. The 4 stumble across another marine reptile with a long tail and long neck that make half it's body.

This was one of the most bizarre reptiles ever.

Tanystropheus.

The 4 watch as the Tanystropheus peacefully walks across the seabed. Great long neck, great long tail, there's hardly any body at all. That long neck is perfect for an ambush predator, and it can swipe that neck forward through a shoal of fish.

Soon the Tanystropheus begins to swim off and disappears into the gloom.

Then suddenly a large marine reptile swam out of nowhere. The 4 were surprised by the sudden appearance, it looked like a cross between a fish and a lizard.

But this was a Cymbospondylus.

One of that great family of marine reptiles, the Ichthyosaurs. He's a primitive member of the group.

And these reptiles will be around for another hundred million years.

The 4 watch as the Cymbospondylus circles back seeming interested in them. They quickly back away from the predator. And he begins to circle them and testing them.

He's slowly moving around them, but one lash of that tail will get it a great burst of speed.

The group huddled together following his movements as he continues to circle them.

And their hearts were hammering, and he gave them a warning lunge.

Twilight and Starlight ready themselves if the reptile gets too close.

Twilight zaps him as he came in again.

And when he came in again Starlight took the second zap. And soon leaves them alone.

And what a spectacular reptile.

Soon the 4 return on the ship explaining to the others about the dive.

Boy, that sure sounds scary. Pinkie said.

Sure was, just glad it's over. Starlight said.

Then suddenly the time warp open and takes them to their next destination in History.

3 seas down, 4 to go.

Next Time.

They'll jump forward 10 million years to witness the dawn of a new Era.

And meet some of the first Dinosaurs.