There are some depths of the sea which people simply cannot swim down to, so luckily we have some nifty cameras to drop down there and take a look on our behalf.

Humans can only dive down to depths of about 300 metres, and to get further we need special equipment like submersibles to pop down in.

Technology can get where the human body can’t, so when scientists conducting an expedition into the Tonga Trench in the Pacific Ocean dropped a camera down there, they got a good look at what lies beneath.

Beyond a certain depth lies a world that is relatively untouched by the world above so anything that drops into it warrants some investigation by the denizens of the deep.

Fortunately for us, that means the scientists got some damn good footage of a massive Pacific Sleeper Shark that swam up to the camera and gave it a bit of a munch.

This is pretty normal shark behaviour since they don’t have hands and have to investigate things by using their mouth, not that you’d want to have a shark be curious about you because then it might bite you.

Dr Jessica Kolbusz explained over the video that this footage had been taken at a depth of 1,400 metres and somewhere to the west of the Tonga Trench.

She said that the Pacific Sleeper Shark could measure up to 4.4 metres long, though the largest of them could have a length of over seven metres which is pretty freaking massive.

As for this magnificent but slightly terrifying creature of the deep blue sea, the expert explained that this particular shark was a lady.

Look at her, she’s magnificent. (The Tonga Trench Expedition)

She said: “This observation occurred to the west of the Tonga Trench, we assumed that it was fairly big, around 3.5 metres long, it was at 1,400 metres depth and due to the lack of observable claspers on the pelvic fins we’ve identified it as female.”

“She goes straight for the camera, from this view we can see completely inside the shark’s mouth.

“Not too long after that she realises it doesn’t taste very good and goes for the bait. It was around 2.5 degrees Celsius which makes sense as we know that they prefer cooler waters.”

Indeed, as Dr Kolbusz narrated, we did get to see just what an inside view of the Pacific Sleeper Shark’s mouth looked like.

The big shark had a bit of a nibble of the camera, giving a good look at what being eaten by it would be like, before moving onto the bait. (The Tonga Trench Expedition)

Fortunately for the scientists and the shark, it soon moved on to the fish they had next to the camera as bait, and did not destroy the rather unappetising deep-sea camera in an attempt to eat it.

After chomping down on the bait attached to the camera rig the very large shark then swam away, giving the scientists a good shot of just how big she was.

Built for those cold, dark depths to which a human dare not dive, the Pacific Sleeper Shark is a very impressive creature which can hunt quietly as it makes little noise moving about in water.

They tend to exist on a diet of bottom dwelling fish, while shark stomachs that have been studied also indicate they have a taste for the Giant Pacific Octopus.

The ocean’s a pretty lonely place really. Miles and miles of water without a soul in sight.

Well, from above the surface anyway, as we know there’s all kinds of fish and life down under the water.

But there’s so much we don’t know about the ocean, as the majority of it remains unexplored.

And somewhere out there, is the ‘world’s loneliest whale’. Yeah, sounds like a kid’s book, right?

The 52-hertz whale has baffled scientists for decades and has never actually been seen.

Also nicknamed 52 Blue, the whale has only ever been heard via hydrophones and is known for having an unusual call.

Getty Stock Image

As its name suggests, this mysterious whale calls at a unique frequency of 52 hertz (Hz) – higher than that of whale species with migration patterns it most closely matches.

The blue whale calls at a frequency between 10 to 39 Hz and the fin whale at around 20 Hz. So, it’s said that this lonely underwater creature essentially has the equivalent call of talking like Mickey Mouse.

This unusual call of the 52 Blue has been detected often in a variety of locations since all the way back in the late 80s and scientists reckon it is just one whale that’s making the sound.

Getty Stock Image

There have been ‘potential’ recordings of another 52-hertz whale in a different place at the same time since 2010 but it seems like it’s a lonely old life for 52 Blue.

Recordings of this unknown creature shared online are pretty eerie, as it swims around the ocean, never to be seen and just making this high frequency call.

The lonely whale tends to be detected in the Pacific Ocean each year and is suspected to travel as far north as the Asleutian and Kodiak Islands and then as far south as the California coast.

52 Blue has inspired various film and music works, with K Pop band BTS releasing ‘Whalien 52’ in 2015 about a lonely whale that ‘can never reach someone else, no matter how hard it shouts’.

But not all experts reckon it’s ‘lonely’.

Whale communication expert Christopher Clark told the BBC in 2015: “Blue whales, fin whales and humpback whales: all these whales can hear this guy; they’re not deaf. He’s just odd.”

Poor guy.

There’s also the theory that the passing of commercial shipping meant whales increased the frequency of their calls so they could be heard above all that noise.

If you thought sharks were the scariest creatures lurking below the surface, you might want to think again.

Because this enormous sea creature managed to make mince meat out of the predator with just one bite – and a gang of flabbergasted fishermen managed to catch the whole thing on camera.

Which is a good job really, as this is one of those things that’s got to be seen to be believed.

Take a look at this:

Despite being just inches away from a trio of terrifying Atlantic goliath groupers which swarmed their small boat in the hopes of securing a meal, Captain John Brossard and his sailing crew were left mesmerised by the creatures.

Even though seeing a shark get devoured wasn’t on their list of plans for that day, they just couldn’t look away.

The lads were out on the water off the coast of Goodland, Florida, while having some fun with their fishing rods when they managed to hook a blacknose shark.

But as they soon found out, you can never be too sure what’s lurking in the water – as the 3ft beast was actually accompanied by three more formidable opponents.

The fishermen spotted three Atlantic goliath groupers gearing up to take the shark down and John quickly grabbed his phone to record some footage.

He can be heard exclaiming: “There’s three of them! There’s three of them. I swear, there’s three of them. Look at those guys waiting for him.”

Captain John Brossard captured incredible footage of the terrifying moment (Pen News)

The groupers – which are saltwater fish known for their staggering size – can be seen circling their prey as the blokes debate which one is the biggest, before the top dog decided to reveal itself.

In one fell swoop, one of the giant fish leapt out of the water, secured the shark between its jaws and swam off with it.

And seen as though they had the beast hooked on their fishing line, the fishermen were heard urging one another to ‘hold on tight’ as their boat swayed when the line snapped.

Speaking of the extraordinary incident, John said him and his crew were left stunned by the strength of the groupers.

He explained: “Basically we were shark fishing when all of a sudden two or three goliath groupers started hanging out under the boat waiting for our catch to come in.

“We were just thinking, ‘Wow, unbelievable! Something is going to eat a shark and it’s bigger than a shark’.

“We were very surprised. Basically it ate the shark, and took down and broke the line. We were using a 50-pound test line and that was not enough.”

One of the Atlantic goliath groupers took down the shark in one swift movement (Getty Stock Image)

Hazarding a guess at how much one of the huge fish weighed, he reckoned that they could have tipped the scales at 500lbs.

Although he still doesn’t want a run-in with a shark, John says the encounter left him feeling that the creatures clearly aren’t as fearsome as they’re made out to be.

He continued: “Do they deserve all the hype? I think sometimes yes and sometimes no, but most of the time, no.

“Of course, if you get in their way, in their territory and the water is dirty, yes, they will taste you to see if you are good eating.”

John also explained that out in the Florida Everglades, there are plenty of animals to be wary of, adding: “There are sharks, alligators, crocodiles, pythons, dolphins and manatees all in one place.

“It’s the only place in the world that has all these creatures in one place and everything there tries to eat everything else.

“Bull sharks have been seen getting eaten by crocodiles and alligators sometimes, and sharks also get eaten by bigger fish there.”

And bizarrely, this is exactly the reason why he chose to fish in that spot – even though he’s well aware of the risks.

“What we like to catch is big fish,” John said. “They are all predators in the Everglades. You don’t wanna get lost there and have to walk or swim home.”