A guy's diving video has left people experiencing 'massive anxiety', and it's easy to see why.
Diving into caves is dangerous enough, but there's even more risks that come with swimming in a blowhole.
A blowhole is a hole in the ground that connects to an underground, partially submerged ocean cave, and the water inside it is constantly rising and falling.
Sometimes, if there's enough force, a jet of water and air can be violently forced out through the hole, making it very dangerous to consider swimming in.
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Despite the evident risk factors, YouTuber Ryan Leahy still chose to do the dive and it's left people who suffer with thalassophobia very triggered.
In case you don't know, Thalassophobia is the extreme and persistent fear of large bodies of water, including oceans, lakes and seas.
In the video, Ryan - who has several pals with him - jumps into the blowhole and swims beneath a dip within the cave.
The water is constantly rising and, if your thalassophobia isn't triggered, then your claustrophobia will be.
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Fortunately Ryan didn't run into any issues during his brief dive, but it was still an extremely dangerous and risky move.
On the video posted 10 years ago, one person wrote: "Even though I know he's ok this still gave me massive anxiety. This stupid stunt could've gone very wrong with one misstep."
"Wow, I held my breath through all of that. I couldn't breath until the video ended! So scared for his life!" commented another.
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A lifeguard also weighed in, writing: "As a lifeguard this is really hard to watch because I've seen many people drown in similar circumstances, please use common sense."
The decade-old video has recently been doing the rounds on Reddit and people have echoed similar sentiments.
Someone labelled it as 'pretty much the dumbest f**king thing to do', as another person said: "I don't have thalassaphobia but I am scared of undercut rocks like that. That sh*t could have sucked him in and spat his corpse out days later, if at all."
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They went on to warn: "Don't ever, EVER under any goddamn circumstances swim around undercut rocks with current flowing into it."
"I peed my f**king pants this triggered thalassophobia and claustrophobia at the same time," added a third.
Dozens of others also branded the manoeuvre as 'dumb' as people were urged to not try it for themselves.
There's been several deaths over the years linked to blowholes, with one of the most recent dating back to last year.
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A woman in Cornwall, UK, fell into an 80ft blowhole and sadly didn't survive the ordeal.
Meanwhile, even professional divers can sometimes run into issues, with legendary diver, Brett Hemphill, losing his life last month.
Niamh Shackleton