In the clip, you see the blokes, armed with nothing more than a paraglider, free falling more than 400m.
They jump off the edge and disappear into the darkness in seconds — out of sight.
This footage was revealed as part of an exploration of the Cave of Swallows, in Mexico.
It gained the name due to the sheer size of the pit — with the widest point being more than 300 metres.
ATLANTEAN GARDENS
AMAZING: The pit is 400m deep
And the narrator of the video informs us of the dangers that lurk below.
He says: “The temperature in the cave is low.
“Vegetation grows quickly at the mouth and the floor is covered with a thick layer of debris and guano in which millipedes, insects, snakes and scorpions live.
The camera then moves to another scene, where we see a tunnel that has been discovered containing a mass of crystal spikes."
He continues: “In 2000, the cave of crystal was discovered by miners excavating a tunnel.
“The main chamber contained some of the largest natural crystals ever found in any underground cave.
“And the largest one measured 36ft in length.”
This amazing video was uploaded to YouTube channel Atlantean Gardens in 2016, but has gained attention recently after it was shared on popular website Disclose.tv.
Amazing caves around the world
These stunning caves are not part of a fairytale, they can be found in some of the world's most remote places in Europe, America and Asia.
Getty Images
Antelope Canyon in Arizona was carved out by thousands of years of persistent wind and flash floods, which is why its smooth walls look so smooth and fluid
The original clip has racked up more than 36,000 hits.
And some viewers believe the footage is proof of a hidden underworld.
One comment read: “There is so much we don’t know about the Earth.
“Whoever is under the Earth’s crust, be it friendly or harmful to us, has lived there for thousands of years.”
And another added: “This is proof the Earth is hollow. There is no way it can be solid.”
This is not the first cave story we have seen recently.
Earlier this month a bloke discovered a goat when he dived head first into a cave.
And before that, a group of friends found something amazing after jumping into a small puddle.
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