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Over 80 percent of the ocean has never been mapped, explored, or even seen by humans. In fact, we've studied a greater share of the surfaces of the moon and the planet Mars than our own seabed. However, if that freaks you out, don't worry. There's plenty of terrifying stuff in its corners we've been to as well.

Last month, Reddit user Fragrant_Whole3328 made a post on the platform, asking others "What is the scariest thing seen in the ocean that has a photographic proof?" It immediately went viral and people have submitted a lot of creepy pictures. From the goblin shark to phantom jellyfish, here are the ones that fuel people's nightmares the most.

#4

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Leopard seals. It’s something about their eyes. They’re large, fast, basically silent predators outmatched in their environment only by the Orca. Their jaws open to almost 180 degrees and they have a bite force comparable to a bull shark. The sound they make fills me with a very primal fear. And in the right lighting their eyes are terrifying. I think it’s a wolf in sheep’s clothing thing, but instead of a wolf it’s a flipping prehistoric water monster.
Edit: I have learned more horrible facts about the leopard seal, a creature I now worship out of fear there may be one under my bed. These snake-headed murder puppies are (on average) 10-foot-long 600-pound prehistoric killing machines that see any warm-blooded animal smaller than them as prey. Females have been measured to top 11.5 feet long and weighed at over 1,100 pounds of pure, flesh-ripping terror. The corners of their extremely long mouths are permanently curved upward and sometimes they smile. Shocking no one: this is usually a sign of aggression. Nothing can erase from my mind the image of these terrible fuzzy Jeff the Killer beasts *smiling.* Their heads average 14.5 inches long (awful), with jaws that can open to 160 degrees — significantly larger and any one human limb or head (I hate this). Their teeth? Guys? Holy f**k, their teeth? (TW: slightly gross uncleaned skull)
Their lower jaw is MASSIVE, even for a predator. Leopard seal skulls and bear skulls are too similar for my liking. Seal eyes have spherical lenses (what the f**k), giving them a field of vision of about 280 degrees. With both eyes, they can see basically clearly 360 degrees. Humans have about 130 degrees of visual field, and maybe 180 total degrees of vision. If you can see a leopard seal, it has already seen you. You can’t sneak up on these (need I remind you, virtually silent when hunting) murder monsters. They’re skilled at adapting to many climates and food sources, so much so that in a world where polar bears and orcas are struggling, leopard seals are considered “of least concern” on the endangered species scale. The way they eat penguins is to essentially catch them and throw them into the air until the penguin is fully degloved. They throw penguins *out of their skin*. They also have highly developed craniofacial musculature, allowing them tongue dexterity and a powerful bite force. They sometimes hunt by just… sucking prey into their mouths underwater.

Bravadu , Animalogic Report

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purpler7355 avatar
Squishy
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Lol! This was fun to read, I'm usually too lazy to read the long posts but I could read a whole book on leopard seals by this absolute author haha

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Puppy Dancing!
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5 months ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Had one who jumped into boats in BC and would threaten the occupants, causing people to stupidly give the seal their catch, which made it impossible for those without a catch to get the nasty threatening seal out of their boats. Many abandoned ship. Do not feed wild animals.

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rullyman
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

That can't have been a leopard seal because they don't live in the northern hemisphere. They're antarctic seals and they are dangerous. A 28 year old marine biologist was killed by one in 2003

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Duuuuuuude
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

"Bite force comparable to a bullshark". Because the bite force of a bullshark is common knowledge. Seriously though, I loved this.

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Natalie H
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

IMO humans are way scarier, and not nearly as cute. Except for Jason Momoa. He’s cute af.

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Bored Potato
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I’m more concerned with how the leopard seal THROWS A PENGUIN OUT OF ITS SKIN??

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T J R
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Same. Now I know I'll never be able to pet one...although I might still try and die happy.

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Denise Melek
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Had to look up their sounds, jaws and eyes. OP is totally right.

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Alecto76
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

A lot of "adorable" animals are terrifying. See 'animal kingdom serial killers' otters.

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Shark Lady
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I've been frightened of them ever since I watched Eight Below.

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Stephanie Evans
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Great writer. I don't care if the information is factual or not--it was such a fun read!

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Megan ️ ️
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

But then you see how cute they are and then you will forget that they are snake-headed murder puppies

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Jack Burton
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

The "least concern" fact is the point. Leopard seals are so dangerous even mankind is not a danger.

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Earthquake903
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

This person should write every description of everything ever, lol

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Cherie Wilson
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I always kept an eye out for these when I was in Antarctica. They bite holes in Zodiac boats and chase you aggressively if you are in a boat. They will kill a diver. They haul out on ice floes and wait for unlucky penguins that hop out of the water. They kill other seals and basically anything that gets close to them. When they yawn, their mouths are blood red inside, lined with lots of sharp teeth. Scary!

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BigCityLady
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

They look so adorable, non menacing and defenseless yet these creatures are what conjure up nightmares!

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Nikki Gross
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I just watched the video attached and HOLY F*****G S**T!!! Those things are straight up nightmare fuel and would take at least a full clip of an AR-15 to take one of those things out or slow it down.

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Pam Ives
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

That's horrible, not scary. They are still, objectively, cute critters.

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Alicia M
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Anyone who saw Happy Feet knows to fear the leopard seal.

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Ti Al
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Awfully well written! And to those still seeing them as kinda cute: yeah, I get it, I still feel the urge to pet a polar bears fluffy ears. But that's maybe their ultimate predatory feature. "Come, little human, come closer, pet the cute animal, .... "

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rullyman
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

A researcher in Antartica was stalked and killed by a leopard seal 20 years ago: https://www.theguardian.com/uk/2003/jul/24/science.highereducation

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Al!
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4 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I still think he's cute. Would inevitably try and pet....

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Leesa DeAndrea
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4 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

The times I've seen them in nature documentaries, I've always thought they looked very dangerous & menacing. They send a shiver down my spine.

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Oddly Me
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

It doesn't "lok" scary, but daaamn!! That description tho.

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LynzCatastrophe
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Do you want me to show you a video of how an alligator kills their prey? You might feel better.

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Suck it Trebek
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I've always thought Leopard Seals look like something from the prehistoric era.

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Riley Quinn
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

This post is bordering on hysterics, and a tad hypocritical, which I don't understand. Unless OP is a vegan, her attitude about this specific apex predator, a category humans belong in, is confusing. Predators eat prey in order to survive. They don't have the "good fortune" to pick up their supper in cellophane wrap to avoid the yucky part of survival. BTW, 70% of their diet is krill. And unless you're swimming in the Antarctic waters, y'all should be safe from their crushing jaws.

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UncleJohn3000
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

And they can survive continual immersion in dihydrogen oxide, one of the deadliest chemical compounds in the world!

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Leslie Donsen
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

"...out of fear there may be one under my bed. " Seriously, what child doesn't suffer from this.

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Siobhan Gournay
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Dear sweet baby Jesus https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT6DXmk3XHxXOJNGEz01MU5ZQfIk6tvlg7Ddg&usqp=CAU

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Pyla
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

What nonsense. They fit their evolutionary niche well. A diver had one giving him gifts. Like most pinnipeds they are inquisitive and harmless to humans. Christ any idiot can post nonsense online.

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rullyman
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

They are not harmless to humans. A researcher in Antarctica was killed by one in 2003.

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Liz Thomas
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

lol no one else gonna talk abt how u expected me to read a whole essay?

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#7

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver The tongue-eating louse. A parasite that eats the tongues of fish and then just hangs out in their mouths.

TheMandarinsToeRing , Marco Vinci Report

#8

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver I'd s**t myself if I happened upon a spider crab

Jormungandr315 , Danté Fenolio Report

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Zephyr343
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I wonder if they actually taste good though? I could probably only eat a half dozen or so

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#9

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Nah. The scariest thing to me is falling into a shoal of Humboldt squid. They hunt in packs (and can easily just think ooh human=food) and wrap their powerful arms (with 100-200 hooked suckers) around their prey and then bite down with this bone-crunching beak They grow to about 2.2m and 50kgs. And the worst part is that squid don't really care or seem to notice if the prey is still alive. And adult humans are usually too much to fill a squid stomach. Imagine getting a leg eaten off and then released only to descend lower and either have the process repeat with another squid or to slowly drift downward into the abyss Oh yea I guess you just drown at that point. But imagine you got gear or something. Terrifying. The Humboldt Squid is sometimes called the Red Devil. 

Squidman-Bruce Report

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#10

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Caves in icebergs that constantly change while you are inside them

yosemitetrailblazer , Jill Heinerth Report

#11

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver For me personally, ANY Anglerfish. Black Seadevil Anglerfish 

Distasteful_T , MBARI Report

#12

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver "The frilled shark” discovered in Awashima, Japan. It inspired the second form of Shin Godzilla, which is also pretty unsettling.

MadBlue , Awashima Marine Park Report

#13

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Siphonophores. Not individual organisms but colonies. by their 'design' no two will look *exactly* alike, & some are quite gorgeous, but others look like an artist render of Yog-Sothoth

HauntingHeartt , serpentproject Report

#14

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Not the biggest or maybe scariest, but I'd argue the - Cookie cutter shark. Is the most ghoulish and depraved - using razor sharpe circular teeth to bore a gaping hole in its victim. Like something from a SAW movie. 

crimsondelagator , JSUBiology Report

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Trin DM
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Their name come from the round shape hole they leave when biting, like a cookie was cut out of the victim

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#15

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver The colossal squid takes some beating... we have never seen one alive, presumably they live too deep to be spotted, but dead ones have washed up or been [cauight accidentally]. On hooks laid out for other fish. Up to 14m long and half a ton in weight they are bigger and meaner than the 'Giant' squid, big enough to prey on sperm whales, which we know because whales bearing gnarly scars from their beaks/hooks have been recorded.

Slanderous , Remeslo Report

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#17

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Phantom jellyfish I think are harmless, but they look terrifying and occupy a lot of space

DilligentChihuahua34 , MBARI (Monterey Bay Aquarium Research Institute) Report

#18

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver This MF has always fascinated/freaked me out. The Barreleye fish 

Tenacious-V , MBARI (Monterey Bay Aquarium Research Institute) Report

#19

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Giant sea spider in Antarctic waters Polar gigantism is a hell of a thing

that90sname , Discovery Canada Report

#20

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Mantis shrimp. We're so freaking lucky these things don't get very big.

Bannon9k , massimosaquatics Report

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C L
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Are these the ones that can unleash the really powerful punch?

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#21

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Magnapinna squid. This thing is wild. Caught on camera at a drilling site.

bigcarri Report

#22

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Googly eyed stubby squid. You’re welcome for the nightmares

unipine , EVNautilus Report

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#23

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Bobbit worms. They look like something out of a hell dimension, they range from 4 inches to 10 FEET long, and their jaws are so powerful that they can snap fish in half. And what’s worse about them compared to a lot of the answers in this thread is that *you can end up with a Bobbit worm in your at home saltwater aquarium by accident*. They like to live in holes of large rocks, which are also popular among aquarium enthusiasts to use as decor, or hide inside the substrate at the bottom of an aquarium. As they are ambush predators who are mostly active at night, you probably won’t figure out that there’s one inside your aquarium until you notice fish have started to go missing. These worms are almost impossible to get rid of out of your large aquarium rocks, as they can cling so tightly to the hole they’re in that you can’t pull them out. They’re also really good at hiding in small spaces. If you tear the worm apart trying to get it out (which is pretty easy to do) the leftover part inside the rock hole can regenerate into a new Bobbit worm. ETA: As to why an aquarist doesn’t just boil the rock/bake the rock before putting it in their tank to prevent Bobbit worms- The rocks the worms hitch in on are called “live rocks”. These rocks are from the ocean floor and contain microorganisms, bacteria, algae, coral, and invertebrates that help make the tank water healthy and stable. So anything that would kill the worm beforehand would also kill all the beneficial organisms on the rock, thus defeating the purpose of buying an expensive live rock. By the time they’ve figured out a Bobbit worm got into their tank it might have been weeks or months since the rock got put in (as Bobbit worms hide during the day and hunt at night). At that point the worm could be anywhere in the tank.

DiligentPenguin16 , Smithsonian Channel Report

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lizorr avatar
Puppy Dancing!
Community Member
5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Bobbit ! Lorena Bobbit cut off her husband's penis. These do look like a cut off penis. Or is it because they will cut off your finger?

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#24

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver The irukandji jelly fish. It’s tiny (1-2 cm in diameter) but is extremely venomous and can even be lethal. The worst part is that you don’t feel an extremely painful wound at first. It’s about 10-40 minutes AFTER they sting you that you start feeling anything. A tiny jellyfish small enough not to see it and land you in the hospital with the possibility of death? No thank you. Some of the symptoms: back pain, diffuse muscle cramping, nausea, vomiting, profuse diaphoresis, headache, anxiety, agitation, nausea, vomiting, and piloerection 

canigetabagel , National Library of Medicine Report

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ƒιѕн
Community Member
5 months ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I had to look that last word up. It's goosebumps for anyone else that don't know.

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#25

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Hands down Sea Lampreys. These creatures haunt me. They are the most horrific thing I've ever seen 

NewScientist4572 , Fernando Losada Rodríguez Report

#26

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Shape shifting creature found in the bottom of the ocean.
Marine biologist Bill Austin has suggested it is likely a comb jelly (ctenophore).

spineapples , CaptainJRD Report

#27

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Great Lakes shipwrecks. For some reason, they are creepier when they are more perfectly preserved. So friggin cool but also scares me

ThisistheHoneyBadger , Thunder Bay National Marine Sanctuary Report

#28

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver I submit for your viewing pleasure, or horror, The gulper eel

RaptorCheeses , Indoona Report

#29

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver A giant squid. One of these can supposedly take down a small whale (not an adult sperm whale… those actually feed on these guys). A person would barely be a snack.

gaoshan , Dr Tsunemi Kubodera Report

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M Gullatt
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

All these photos remind me why I don't swim where I can't see my feet! Even lakes have huge catfish.

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#30

Someone Asks What's The Scariest Thing In The Ocean That Has Photo Evidence, And 30 People Deliver Great white sharks. Let’s not overthink this.

zahnsaw , Terry Goss Report

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Zephyr343
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5 months ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Sharks are fascinating creatures. They can be scary but never deserved the reputation they got after Jawa

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