What’s At The Bottom Of The Great Blue Hole?

Narrator: There’s a
massive underwater sinkhole off the coast of Belize that extends 125 meters into the Earth’s crust. It’s called the Great Blue Hole. Scuba divers and snorkelers have been cruising the
surface waters for decades, but few have dared to venture deeper and explore what lies
beyond the blackness. In the winter of 2018, a
crew from Aquatica Submarines started their descent to
the bottom of the Blue Hole. Their mission was to create a 3D map of the sinkhole’s interior,
but along the way, they came across some common
and not-so-common sights. As the crew started, they
found the usual suspects: reef sharks, turtles, and giant corals. But as they pushed 90 meters,
life started to vanish. The culprit was a thick layer
of toxic hydrogen sulfide spanning the width of the entire sinkhole like a floating blanket. Erika Bergman: Underneath that
there’s no oxygen, no life, and down there we found
conchs and conch shells and hermit crabs that
had fallen into the hole and suffocated, really. Narrator: Past the conch graveyard and toward the bottom of the
hole, around 120 meters deep, the team found something
they did not expect: small stalactites. The surprise gave scientists clues to the hole’s ancient past. Bergman: Stalactites can only form because water is dripping down stone. And so we know that this
was a big, dry cave, and it was during a really
prolific era on Earth, so there were probably
lots of stuff living in it. Narrator: Scientists think the cave formed during the last Ice Age, which
ended about 14,000 years ago. That’s when sea levels began to rise, and the cave flooded and collapsed, leaving behind the Blue Hole we see today. Researchers think that
other marine sinkholes, like Dragon Hole in South China Sea, and Dean’s Blue Hole in the Bahamas probably formed the same way. As the scientists continued down the hole, they found another clue to the past: a light buildup of silt on
top of the conch graveyard. Bergman: The silt itself on the bottom is a pretty good record of all
of the different hurricanes and storm cycles and
glaciations that have happened, so we can see that right around the time of the Mayan collapse, there
were huge, huge storm cycles followed by very significant droughts. Narrator: As the team continued to explore the bottom of the hole, they found a 2-liter Coke bottle and a lost GoPro containing
some vacation photos. But that wasn’t all. Bergman: We did encounter
two of the probable three people who have been
lost in the Blue Hole, so we found kind of the resting
place of a couple folks, and we just sort of very respectfully let the Belize government
know where we found them, and everyone decided that we would just not attempt any recovery. It’s very dark and peaceful down there, just kind of let them stay. Narrator: Scientists predict this hole won’t be around forever to explore. Every day, waterfalls
of sand fall into it, slowly filling it up like
an underwater hourglass. But as for now, we can
still admire its beauty and study its many mysteries.

23 thoughts on “What’s At The Bottom Of The Great Blue Hole?”

  1. Omg tho…that can be their final resting place. So tragic and heartbreaking! Love and prayers of rest and salvation to those who rest there. RIP. Peace, love, light.

  2. Even if there is nothing when you go deeper in the whole, you will always feel like something is in there, watching you…

  3. People died in that hole? Sucks they died but I wouldn't mind dying in a place like that. My body being discovered years later and uncovering a clue to something. I enjoy the concept of mystery beyond the grave.

  4. I don't understand all the snide remarks…if you can't say something constructive about the work they have done looking into the structure, the don't say anything at all…people are trying to clean up the planet…what are you people doing besides sitting around making dumb comments about the things they did find. I think the bodies should have been brought up and analyzed to find their families who wondered what happened to someone they could be related to.

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