NARRATOR: Tulum, Mexico--
here, on the eastern edge
of the Yucatan
Peninsula, lie the ruins
of one of the last
cities built by the Maya.
Behind me is the
Temple of the Diving God.
And the western doorway
is a stucco relief
of a winged being,
who is either diving
down from the sky or he's
diving down into the water.
His real identity is not known.
NARRATOR: In addition
to the diving god,
it has been documented that
the interior of the temple
once contained a mural
portraying the Aztec water
goddess, Chalchiuhtlicue.
While the Aztecs did not
occupy the Yucatan Peninsula,
their ancestors,
the Olmecs, did.
And some believe there may
be a profound connection
between this area of
Mexico and the Aztec water
gods, who ruled over a
paradise-like world called
Tlalocan.
Descriptions of Tlalocan
come from the Aztec shamans--
spiritual guides who could
access this other-worldly realm
through whirlpools
while in a dream state.
There's an intriguing site
right here off the coast
of the Caribbean Sea.
And it may have a connection
to the Aztec Tlalocan.
And its name is Cenote Angelita.
And it's right here.
NARRATOR: A cenote
is a sinkhole where
limestone bedrock has
collapsed, exposing
the freshwater underneath it.
Many of the cenotes in
this part of the Yucatan
are believed to have
been formed by the meteor
strike that wiped
out the dinosaurs
more than 65 million years ago.
As a result of this
extreme impact,
they contain high amounts
of shocked quartz.
Shocked quartz is
a particular type
of quartz that
really needs very,
very high pressure to form.
Quartz is a crystal.
But every crystal is
not completely uniform.
It's comprised of smaller
little pieces that
have to align along defect.
And high pressure changes
the internal structure
of the quartz.
NARRATOR: Scientists have
long known that quartz
is able to convert the earth's
natural electrical vibrations
into a form of energy.
And some have even suggested
that it could be used
in the formation of
wormholes through
an electromagnetic reaction
called the Casimir effect.
The idea is, if I
take two metal plates
and stick them in
the vacuum of space,
it turns out, because
of quantum fluctuations,
this creates an
effective attractive
force between the plates.
One can think of this
as a negative energy.
Now, an intriguing
idea that we get
is that this is
exactly the principle
we need to understand perhaps
how to stabilize a wormhole.
NARRATOR: Although
there are a number
of cenotes in the Yucatan,
Cenote Angelita is very unique.
About 100 feet
below its surface,
the freshwater meets up
with the salt water coming
from the ocean
beneath it, creating
a mysterious underwater river.
David Childress has enlisted
diver Spencer Stander
to help him explore the cenote.
We'll see the river
around an island.
And you'll see
these bizarre trees.
It's like a decrepit forest.
It's so cool.
It looks like a moving river.
You're going to be blown away.
NARRATOR: Although the
waters of the cenote
are extremely murky on the
surface, at 15 feet down,
everything becomes
crystal clear.
But once they
descend to 100 feet,
it turns as black as the
darkest reaches of space.
And even though we
had lights with us,
it was still like we were
floating within the cosmos.
But then as we got
down at 100 feet,
suddenly we could start to
see the sides of the cenote.
NARRATOR: Here, the
freshwater of the cenote
meets the salt
water of the ocean,
forming one of nature's
most mysterious anomalies--
an underwater river.
It is here that some
ancient astronaut
theorists believe
there may really exist
a portal to another world.
It can't be a coincidence that
both Mayan and Aztec beliefs
incorporated a
swirling pool of water
where they were able to travel
to some other sacred paradise.
Maybe we're talking about a
form of technological travel
that isn't understood
in modern form.
But through the
ancient astronaut lens,
we have to understand,
the ancient man
went to great lengths to depict
and explain how this form
of travel was taking place.
And it might be that
this is something that
was extraterrestrial in nature.
