Despite their seemingly harmless, squishy appearance, some jellyfish are among the most venomous creatures on Earth.
One species, the Australian box jellyfish (Chironex fleckeri), can kill within minutes and is nearly invisible in the water, making it even more dangerous.
But that didn’t stop George Kourounis, a 54-year-old adventurer from Quebec, from finding out firsthand just how painful its sting can be.
Who is George Kourounis?
Kourounis is known for his death-defying adventures, including exploring the Darvaza gas crater, also called the ‘door to hell’.
The Angry Planet host has built a career out of chasing extreme weather and natural disasters.
But this time, he took his daring nature to a whole new level by deliberately stinging himself with a box jellyfish.
Testing the Venom of a Box Jellyfish
In a video originally shared on his YouTube channel, Kourounis set out to see how well he could endure the venom of a box jellyfish.
He was joined by Ben Cropp, a renowned underwater filmmaker who had been researching remedies for box jellyfish stings.
Cropp had been stinging himself repeatedly to test possible treatments. Inspired by this, Kourounis decided to experience the pain for himself.
The Most Venomous Creature in the Ocean
Before the experiment, Kourounis explained just how deadly box jellyfish are:
- Their venom is designed to instantly stun or kill prey.
- Each of their 15 tentacles can grow up to 10 feet long.
- Each tentacle contains around 5,000 stinging cells, filled with potent toxins that attack the heart, nervous system, and skin.
- Victims often go into shock and die within minutes.
- The jellyfish’s tentacles are triggered by chemical detection, not touch, making them even harder to avoid.
Cropp confirmed that box jellyfish are the most dangerous creatures on the planet, with venom more powerful than anything else known.
Stinging Himself on Purpose
The duo captured a nearly invisible box jellyfish in the shallow waters of Australia’s Great Barrier Reef.
Cropp noted that the jellyfish had lost some of its tentacles, but that didn’t make it any less dangerous.
When Cropp placed the tentacles against Kourounis’ bare arm, he quickly began to feel the effects.
“This will ruin your day at the beach,” he warned. “It doesn’t look like much—a translucent blob of goo—but it has some of the most toxic venom in the world.”
Cropp explained, “The poison then travels just under the skin and slowly works its way up to you. The initial pain can send people into shock, and sometimes they don’t come out of it.”
Immediate Pain and a Questionable Remedy
Seconds after contact, Kourounis felt a violent stinging sensation that quickly intensified.
To treat the sting, Cropp applied his own uncertified antidote, which failed to work. They then resorted to a more common remedy—vinegar.
Experts recommend the following immediate actions if stung by a box jellyfish:
- Exit the water immediately.
- Call emergency services.
- Apply vinegar, hot water, or baking soda to neutralize the stinging cells.
The Aftermath
After pouring vinegar on the sting site, Kourounis noticed his skin beginning to swell with raised bumps.
Despite the extreme pain, he managed to endure the venom relatively well.
In his closing statement, he admitted, “Box jellyfish—one of the most dangerous creatures on the planet. Hurts like hell. I don’t think I’ll try that again anytime soon.”
A Reminder to Stay Safe
This experiment highlights the serious danger of box jellyfish stings.
With their near-invisible appearance and deadly venom, they are a major hazard in Australian waters.
Anyone swimming in box jellyfish territory should always take precautions and be aware of emergency response measures.
Would you ever take on a box jellyfish sting challenge like Kourounis? Most people would probably say, not a chance.