A YouTuber used a see-through box to show the tiny size of the passageway an American man was trapped in when he suffered the 'worst death imaginable'.
John Edward Jones, 26, died on 25 November 2009, after he and some of his family members went to explore the Nutty Putty Cave system in Utah.
John went off on his own during the adventure in a bid to try and find a notoriously tight passage known by explorers as the 'Birth Canal'.
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At six foot tall and weighing more than 14 stone, John was a big guy and knew he'd have to crawl through the space, but it wasn't long after he wiggled into what he thought was the 'Birth Canal' that he found himself completely stuck, realising he'd tried to squeeze down the wrong passage.
John had one arm above his head and the other down by his side, and was trapped headfirst in the hole which measured just 10 inches by 18 inches.
To demonstrate just how small that area really is, content creator Seb le Videaste used three pieces of wood and a see-through box to simulate the passage in the cave.
Demonstrating that he stood at a similar height to John, Seb got down on his front and poked his head through the hole before attempting to wiggle the rest of his body through it.
He managed to get his shoulders through and wiggle up to his chest, but Seb never made it all the way through.
Both for Seb, and for John in the cave, there was no way to turn around.
Seb issued a warning to claustrophobes as he posted the video, writing (translated): "CAUTION CLAUSTROPHOBIA."
One viewer made clear they couldn't cope with the idea of being trapped in such a small area, writing (translated): "I already panic when I'm stuck in the toilet because I can't open it."
Rescuers worked tirelessly to free John, who was a dad-of-one, from the cave, and at one point managed to pull him up slightly through the passage to get him into a more comfortable position.
Things quickly became worse, however, when one of the pulleys used in the rescue mission failed, and John slid back down the passageway.
Tragically, John was never freed from the cave, and he ended up dying due to cardiac arrest.
Authorities in Utah have since sealed the cave, with John's body still inside, in an effort to prevent any other explorers from meeting the same fate.
Emily Brown