Maybe it's time we Homo sapiens re-evaluated our relationship with the oceans of the world. Roughly 95 per cent of it remains unexplored, and it seems as if every other day we're finding out something new and unsettling.

Old emotions can die hard. So for the unconvinced holdouts, here's a little push, via Twitter: ‘Prehistoric, Dinosaur-Era Shark With Insane Teeth Found Swimming Off Coast of Portugal’

That sea-dwelling, serpentine conglomeration of nightmare fuel is the frilled shark, one of the oldest - and in the running for the creepiest—living species on the planet, reports NDTV.

Its prehistoric contemporaries, like Tyrannosaurus rex and triceratops, died out long ago, but the frilled shark is still swimming around deep below the surface of the world's oceans, scientists say.

They know that because of an accident that sounds vaguely like the plot of a straight-to-video horror movie. A group of European Union scientists were trawling the depths of the Atlantic Ocean this month, trying to figure out a way to ‘minimize unwanted catches in commercial fishing,’ according to the BBC.

Instead, they ended up capturing one of the rarest and most ancient creatures on the planet, one that may have inspired 19th-century tales of ‘sea serpents.’

The largest can grow 6 feet long—the size of a tall man. The shark is named after its gills, which have frilly, fluffy edges, but the cuddly factor ends abruptly there.

Inside its short-snouted head are 300 more reasons to never go farther than the beach: hundreds of needle-sharp teeth, neatly lined in 25 rows.

It uses quick lunges to sink those teeth into other sharks, fish, octopuses and squid.

Humans know very little about the frilled shark because it lives deep in the ocean, off the coasts of Japan, New Zealand and Australia.

In its 80 million years on the planet, it has rarely come into contact with humans or been seen or filmed in its natural habitat. Clearly freaked-out 19th-century sailors were the first to write about it.

The frilled fish has a remarkably simple anatomy, probably because of a lack of nutrients in its aquatic environment. But there's no definitive answer about why it outlived its Cretaceous Period contemporaries.

From time to time, scientists will set out to see what's swimming around in unexplored regions of the sea, then use the internet to show the world what got tangled up in their nets full of nope.