Sub on ocean floor comes into contact with deep-sea monster that predates dinosaurs in chilling footage

The ocean is a mysterious place, and if you have a fear of the deep waters, this video will probably make it worse.

Footage of a submersible capturing some intriguing footage of a pre-historic sea animal has resurfaced, as it was making its way across the ocean floor.

The OceanX sub captured something so shocking that scientists that were working on it were left speechless - and it even made history.

If you're wondering just how big the pre-historic creature was, have a look:

If you're made to feel uncomfortable by some GoPro footage that's posted online of what may lay in the distance underwater, then this viral video will leave you shell-shocked.

It's also a lot weirder, as we get to be up close and personal with the animal in question.

Originally posted on the OceanX YouTube channel in 2020, the short video captures the moment that explorers made the ground-breaking discovery.

In the description of the video, the company states that it partnered with the Cape Eleuthera Institute to become the first ever submersible to tag an animal.

"Our objective was the deep-sea shark, the bluntnose sixgill," it explained.

"This ancient species predates most dinosaurs, and is a dominant predator of the deep sea ecosystem."

FSU Marine Lab's Dr. Dean Grubbs was the lead scientist on the mission, and succeeded in achieving the goal.

The pre-historic shark helped the team tag an animal from a submersible for the first time ever (Youtube/OceanX)

Grubbs let the team to become the first ever to put a satellite tag on the elusive species of sharks on the sea floor, with scientists in the past only able to do so by bringing them up to the surface.

The team did this on the sea floor, and the footage also shows how shocked the men were in the sub.

Spotting the shark swimming around it, one of them said: "Oh, wow!"

"Look at the width of that thing!"

Attempting to get her in the prime position to tag, they were hesitant to tag her when she was belly-side, waiting for her to get closer.

Which she did, pushing her nose up against the side of the submarine, glancing up at the intrigued scientists, even seeming to roll her eyes as she swam away.

The scientists couldn't believe just how big the female shark was, pointing out that she was larger than average.

The shark's pupils were deep green as it glanced up (Youtube/OceanX)

Her species usually grow up to 20-feet in length, but rarely anyone has been so up close and personal with one before.

The species predates most dinosaurs, meaning they have roamed the seas for tens of millions of years.

People were just as in awe in the comments section.

One user said: "If not the size, this shark's eye alone would have given me a straight heart attack."

Another commented: "That eye close-up was wicked."

A third put: "Scientists, 'Whoa.' That's when you know it's serious."