Name: What's At The Bottom Of The Great Blue Hole?
Uploaded: 2021-11-02T02:42:01.000Z
Duration: 3 min 38 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Narrator: There's a massive underwater sinkhole

have been cruising the surface waters for decades,

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.

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:

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

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 toward the bottom of the hole, around 120 meters deep,

the team found something they did not expect:

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.

leaving behind the Blue Hole we see today.

Researchers think that other marine sinkholes,

As the scientists continued down the hole,

a light buildup of silt on top of the conch graveyard.

is a pretty good record of all of the different hurricanes

and storm cycles and glaciations that have happened,

of the Mayan collapse, there were huge, huge storm cycles

and a lost GoPro containing some vacation photos.

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,

let the Belize government know where we found them,

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

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

stuff

entire

massive

significant