It might be true that a lot of divers are concerned about such species of shark as the bull shark, the great white, and the tiger shark, the chances of being attacked by one are actually rare. The odds of suffering from a serious injury or worse are often not even considered when it comes to less infamous marine animals. Too many divers are reportedly unaware of the danger that some of the smaller and even nice-looking sea creatures pose.

Some of these deep-sea denizens will leave you with some nasty bites. Others can just plain kill you. So without further adieu, here are the 12 most dangerous sea creatures that you should know about the next time you decide to go diving.

12. Titan Triggerfish

Domain: Indo-Pacific

Most triggerfish are small. Numerous species of triggerfish are actually friendly. The Titan triggerfish, however, is a different story. The Titan triggerfish can be as long as one foot in length. They have powerful jaws and very sharp teeth.

This variety actually will defend its “territory” against all intruders. These triggerfish can be highly aggressive. They have severely damaged a number of divers. Indeed, locals who go diving in the triggerfish’s native habitat are more actually more cautious of these fish than any other sea creatures.

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11. The Stingray

Domain: Subtropical and tropical waters

Experts confirm that stingrays only attack to defend themselves. Nevertheless, there are enough incidents to mention them. Most stingray wounds are found on the lower legs because stingrays stay buried in the ocean floor’s sand.

Divers accidentally step on them. The stingray’s venom is very painful but not usually deadly. If a diver is somehow stabbed in the abdomen. chest or heart it can nevertheless be deadly.

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10. Flower Urchins

Domain: Indo-West Pacific

Beware the beautiful but deadly flower urchin. The Guinness Book of Records describes the flower urchin as the earth’s “most dangerous sea urchin” as it has killed many humans. The venom from these creatures is deadly and potent. Once they touch your bare flesh, it can inject you with venom that creates muscle spasms, shock, paralysis, drowning, and death.

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9. Electric Eels

Domain: The Orinoco and Amazon Rivers

Electric eels are predatory creatures. The electric discharges can pack a maximum of 600 volts. They are capable of this because their bodies contain more than 6000 electrolytes cells. That high of a charge can actually initiate heart failure in human beings. Thus, divers are advised to avoid them.

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8. Textile Cone Snails

Domain: Australia, French Polynesia. the Indo-Pacific region, and the Indian Ocean (between east Africa and Hawaii).

Textile cone snails, aka the cloths of gold, are very dangerous. They are nearly 3.5 inches long and have attractive shells. Unfortunately, they have small harpoons full of their killer neurotoxin. When threatened, they fire off the harpoons in all directions. The projectiles can penetrate bare flesh. Barbs from the adult snails can even break through a wetsuit. The species nicknamed “cigarette snails” are so deadly their victims only have time to smoke a single cigarette prior to their deaths.

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7. The Great Barracuda

Domain: Across the globe/especially deep oceans, near coral reefs, tropical regions, and any coastal habitat along a continental shelf

This fish can grow up to six feet in length. It’s fast, aggressive and has sharp teeth. They’re famous for attacking people, especially divers wearing anything shiny. They will leap out of the sea to attack boaters and are dangerous even when dead since their flesh is known to contain the ciguatera toxin.

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6. The Blue-Ringed Octopus

Domain: Coral reefs and tide pools in the Indian and Pacific Oceans, especially from Australia to Japan.

The infamous blue-ringed octopus is no larger than eight inches in length but its venom can kill as many as 26 adults in mere minutes. Worst of all, their bite is painless so you’re clueless until symptoms appear. Symptoms include blindness, nausea, heart failure, paralysis, and respiratory depression. There’s no antivenom but it usually flees from divers.

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5. The Lionfish

Domain: Atlantic and Indo-Pacific waters

Lionfish are venomous fish with poisonous spines. The venom is so infamous that there aren’t many ocean predators who will prey upon lionfish. Expert divers have confirmed that the sting from a lionfish can be very painful and causes first nausea and then breathing difficulties.

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4. Dubois Sea Snakes

Domain: Off the coasts of Papua New Guinea and Australia

The Dubois sea snake or reef shallows snake is one of the most dangerous snakes on the planet. In fact, it is one of the top three poisonous snakes alive today. Scientists have proven it is also officially the most poisonous sea snake currently known to man. While they are reportedly not too aggressive, they are most active at dusk and dawn.

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3. The Reef Stonefish

Domain: Coral reefs in the Indian and Pacific Oceans from the Great Barrier Reef to the Red Sea

The Reef Stonefish has 13 poisonous, needle-sharp spines and can blend into the terrain. Thus, divers can step on it. Indeed, even on land, the poison remains toxic for as long as a full day. Its painful sting can cause respiratory paralysis that can lead to heart failure. The after effects can particularly damage the kidneys.

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2. The Pufferfish

Domain: The Atlantic, Indian and Pacific Oceans

The pufferfish is the planet’s “second most poisonous vertebrate.” Their venom is actually 1200 times deadlier than cyanide. They expand or puff up when threatened. Their poison can kill an adult in minutes. While their meat is considered a delicacy in some countries, if not prepared properly the meat is poisonous. There is no antidote.

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1. The Box Jellyfish

Domain: The Indo-Pacific Ocean

The box Jellyfish, aka “sea wasp”, is one of three varieties of dangerous jellyfish. Their stings are very painful and fatal. In fact, even less venomous varieties are generally fatal to children. Each of their long, dangling tentacles has roughly 500,000 microscopic mechanisms that can inject poison into a victim. A diver can die from heart failure before reaching the shore.

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