There have been countless
UFO sightings over the years, but many experts consider
this next piece of footage the gold standard. Take a look for yourself. <i> It's just after dark</i> <i> on August 25th, 2013,</i> <i> in Aguadilla, Puerto Rico.</i> <i> The crew of a United States
Customs and Border Patrol plane</i> <i> is taking off
for a routine mission,</i> <i> when they notice
a strange pinkish light</i> <i>approaching from the northwest.</i> <i> They turn on their thermal
imaging camera</i> <i> to track the object.</i> <i> And this is what they see.</i> <i> Let's take a closer look.</i> <i> It appears to be
a metallic sphere,</i> <i> moving fairly quickly
around the airport.</i> <i> Then it heads out
over the ocean,</i> <i> where it does something
truly unexpected.</i> <i> Did you catch what happened?</i> <i> Let's zoom in.</i> <i> The object seems
to splash down in the water</i> <i> before reemerging
seconds later.</i> <i> Even more bizarre,</i> <i> the object then splits</i> <i> into two separate craft.</i> And, people, there is
no known Earth technology that can do that. <i> After nearly four minutes,</i> <i> the object disappears
from view.</i> <i> Now, Puerto Rico
is the location</i> <i> for several sightings
of so-called USOs--</i> <i>unidentified submerged objects.</i> <i> Back in the 1990s,
a Navy helicopter pilot</i> <i> allegedly saw an unidentified
dark underwater mass</i> <i> during a training exercise.</i> <i> Another published report
describes a similar incident</i> <i> in 1963, during
an anti-submarine exercise</i> <i> led by the USS Wasp.</i> [McMillan]<i> Keep talking
about these incidents</i> occurring around
their aircraft carriers, naval ships. Puerto Rico, long history <i> of interesting sightings,
very long history.</i> What makes this video
so special is that it comes straight
from a million-dollar infrared camera
mounted on a government plane. There's a ton of data
to analyze here. So what do our experts think? [Hoffman]<i>
It's a credible case,</i> <i> it's a credible video.</i> [Harris]<i> Richard Hoffman heads
the Scientific Coalition</i> <i> for Unidentified
Aerial Phenomenon.</i> <i> First question:
Is the video real?</i> The telemetry you see
on the screen showing GPS location identically matched
what you had with radar. So, there really was
an aircraft. [Harris]<i>
Next, Hoffman's team determines</i> <i> the object's temperature
to help identify it.</i> <i> They compare
the heat signature of the craft</i> <i> to some cows on the ground,</i> <i> in this frame
at the top of your screen.</i> We broke the video
into 256 shades, from white to black. All different shades of grey. <i> And we were able
to match that up</i> <i> with a temperature
of the cows</i> <i> to match the temperature
of the object.</i> <i> The object was roughly
at about 104 degrees.</i> [Harris]<i> Right away,
that eliminates a jet engine,</i> <i> which emits exhaust
15 times hotter.</i> [Hoffman]<i> Thermal signature
doesn't match anything we know.</i> And there is no sign of any kind
of propulsion system on it. [Harris]<i> Then they figure out
the object's size,</i> <i> using this frame,
when the object</i> <i> goes behind a light post
two pixels wide.</i> [Hoffman]<i> Okay, well,
the object</i> <i> went behind it
and was blanked out.</i> <i> So, about,
maybe it's two pixels.</i> <i> That's where we come up with</i> <i> it's about
three to five feet in diameter.</i> [Harris]<i> Based on that analysis,</i> <i> Hoffman says the most likely
earthly explanations</i> <i> are eliminated.</i> [Hoffman]<i> We ruled out
that it wasn't a balloon.</i> <i>There was about 18-mile-an-hour
winds from the northeast,</i> <i> and this object was going</i> <i> in opposite directions
from that.</i> So it's clearly not a balloon. [Harris]<i> What about a drone?</i> <i> Our aviation expert
Tim McMillan is skeptical.</i> How are you achieving flight without an air foil,
without an angle attack, without wings, to simplify that? How are you doing that? [Harris]<i> And finally, a bird?</i> [Hoffman]<i> We took a look
at thermal signatures of birds</i> <i> and various other objects,
and it doesn't match</i> <i> anything like this.</i> And there you go.
It's-- It's unidentified. It's not from any place here. So, is it proof or not? Well, you might think
it's a bird, a balloon, or a manmade aircraft,
but it is hard to explain how this goes in and out
of the water and splits. So, folks, we're gonna
call this a UFO. You almost never see
an object like this going into and out of the water. That's amazing. <i> It's May 2011
on the Chandeleur Islands,</i> <i> 50 miles offshore
from Southeastern Louisiana.</i> <i> Architect and amateur
archaeologist George Gele</i> <i> has received permission
to do exploration dives</i> <i> in the area
with a remote operated vehicle.</i> <i> What his underwater videos
reveal is astonishing.</i> [dramatic theme playing] <i> Scattered on the seafloor
are what appear</i> <i> to be large granite blocks.</i> <i> The cubic stones don't seem
to be at all natural,</i> <i> since they all have
90-degree squared edges</i> <i> and some have
carvings and cuts.</i> <i> Check out what they look like
after he's brought them up</i> <i> and cleaned them off.</i> <i> Could they once have been part
of a larger structure?</i> <i> George says he's certain
this is the site</i> <i> of an ancient lost city</i> <i> that he has named Crescentis.</i> I'm an architect
and a contractor, so I do know
what buildings look like, even if they're under water
and covered up somewhat with sand,
and that's what we have here-- an ancient culture that
nobody knew that was there. [Harris]<i> George says
the location</i> <i> of this submerged civilization</i> <i> first came to him
while sleeping one night</i> <i> in the 1960s.</i> I had
an incredibly vivid dream. I got up and I sketched it, and the dream was what I called
"The Star of David Diagram," <i>and it showed, in that diagram,</i> that if you start off at Giza, at the Great Pyramid, <i> there were six cities
at the same latitude as Giza,</i> <i> and one of them
was in Louisiana.</i> [Harris]<i>
Journalist Erin McCarthy says</i> <i> George believes the blocks
in this video</i> <i> could be
at least 12,000 years old,</i> <i> predating the Incan, Mayan,
and Aztec civilizations.</i> Granite is not natural
to the area. <i> His theory is they were
brought from somewhere</i> that's not Louisiana, <i> and floated
down the Mississippi</i> <i> at some point
before the last Ice Age,</i> when this area of Louisiana would've been above water. [Harris]<i>
And wait, there's more.</i> <i> George believes that
just as we see in Giza,</i> <i> there was
a 280-foot-tall pyramid here</i> <i> that is now buried in silt.</i> He claims that it produces <i> a ton
of electromagnetic activity,</i> and fishermen who fish
out near that area say that it actually affects
their compasses. [Harris]<i> George says
this build-up of energy</i> <i> gives more credence
to his pyramid theory.</i> [Gele]<i> I know that having done
50 years of research</i> <i> in how they produce energy,</i> the only architectural form
that I'm aware of that can do that
is a pyramidal structure. [Harris]<i> At least one
Russian study has found</i> <i> a pyramid's chambers
can collect and concentrate</i> <i> electromagnetic energy.</i> It seems clear
these huge blocks were placed here
by someone or something. As glacial ice melted at the end of the Ice Age, it flowed
down the Mississippi River into the Gulf of Mexico, submerging the coastline
and moving it 60 miles inland. Could these blocks
have been deposited here by the river? Or could a lost Louisiana city, which George calls Crescentis, have been the Ice Age's
greatest casualty? [tranquil theme playing] [Harris]<i> Archeologist
Dr. Ed Barnhart says</i> <i> if this site
is really 12,000 years old,</i> <i> it would be from around
the time of the Clovis culture,</i> <i> thought to be the first
inhabitants of the Americas.</i> Clovis was not
a culture that gathered <i> in large groups of people
or in sedentary ways.</i> <i> They were hunter-gatherers.</i> <i> They traveled,</i> and that's how they survived. [Harris]<i> So, if it's unlikely
the nomadic Clovis</i> <i> would build a permanent site
like Crescentis,</i> <i> what about
the hum-drum explanation</i> <i>that this is just an artificial
reef from more modern times,</i> <i> built as a habitat
for marine life?</i> Typically, when we make reefs, <i> we don't make them
out of stone.</i> <i> We use things like tires
and other lighter material</i> <i> that works just as well
for creating natural reefs.</i> [Harris]<i>
Physicist Matthew Szydagis</i> <i> weighs another theory.</i> <i> Could these granite blocks
have been ballast</i> <i> dropped from European ships
colonizing the area</i> <i> centuries ago?</i> At one point, ballast blocks were needed on ships <i> to lower their center of mass</i> <i> in order to increase
the stability of the ship.</i> <i> Then, these rocks
may get dumped.</i> [Harris]<i> The ballast stones
were normally discarded</i> <i> in order to keep
the weight the same</i> <i> as ships pulled into port
to pick up new cargo.</i> [Szydagis]<i> However,
calculations have been done</i> that show you need at least
three dozen ships or more <i> to have dumped their ballast
all in this one location.</i> It just doesn't make any sense. [Harris]<i> So what about
the theory that</i> <i> the electromagnetic energy
detected here</i> <i> is evidence
of a lost pyramid?</i> <i> NASA geologist Bob Anderson
investigates.</i> If you take a rock that has
a magnetic field in it, and you take it out of place,
and drop it, <i> it still has
the magnetic field in it.</i> <i> That magnetic field
is frozen in those crystals.</i> <i> So it would not surprise me
that if somebody took</i> <i> a magnetometer down there
and looked at these rocks</i> <i> that they would have
a very localized magnetic field</i> from somewhere else where
the magnetic field is strong. [Harris]<i> Then could this
actually be a lost city?</i> Sea level can change over time, and so I think it makes sense
that you may have a city that's farther than where
the coast currently ends. Our verdict? These are
possible city ruins. We know these rocks
don't belong there, and we don't think
it's an artificial reef, and as Professor Szydagis said, sea levels have risen
in the gulf dramatically over the millennia. But we also need to be cautious. More research needs to be done
before we know for sure what we're looking at. <i> Japan's Ryukyu Islands extend</i> <i> almost to Taiwan,</i> <i> and they've long been
an attraction to divers.</i> <i> Most come to see
hammerhead sharks,</i> <i> but in 1986,
Deborah Dickson-Smith</i> <i> came for another reason.</i> <i> She was there
to get a special tour</i> <i> of the official site
known as Yonaguni.</i> [Dickson-Smith]<i>
Go in this dramatic entrance,</i> <i> it was like
stepping back in time.</i> [Harris]<i> Once out
through the other side,</i> <i> a whole city seems to appear.</i> [Dickson-Smith]<i> It really was
one of those "wow" moments.</i> <i> And when
you look over the edge,</i> <i> you can see down</i> <i> into this
very, very deep gully.</i> It was very dramatic. [Harris]<i> Let's look
at the details here.</i> <i> There are straight lines,
steps, and sharp angles.</i> [Banias]<i> It seems to be that
whatever this structure is,</i> somebody built it there and sea levels rose enough that it got submerged. [Harris]<i>
In this artist's rendering,</i> <i> it looks like a small city
or a compound with a pyramid.</i> <i> And as Deborah learned,
the site may be connected</i> <i> to an ancient legend.</i> There's a theory
that the video is evidence of an ancient
Japanese civilization known as Yamatai. <i> It's said to have been
a large powerful nation</i> <i> that was wiped off
the face of the world</i> <i> when sea waters rose</i> <i> and their cities were buried
under ocean water.</i> [Harris]<i> Yamatai is said
to have been ruled</i> <i> by a secretive sorceress
named Himiko.</i> <i> Its location
has never been determined,</i> <i> much less the reasons
for its disappearance.</i> Here's the thing.
Unlike Atlantis, the existence of Yamatai
shows up in historic documents from around 300 A.D. There's even a record
of their queen, Himiko, sending an envoy
to the Chinese emperor. The theory is that Yamatai sank due to the shifting
tectonic plates in the region. But what's the real story? Let's see
how our experts tell it. <i> Geologist Bob Anderson
says it's not unreasonable</i> <i> to think this site
was once on dry land.</i> [Anderson]<i> Go back
20,000 years ago,</i> <i> the shorelines moved around
to different places,</i> so you can't rule out
that that was above water. [Harris]<i>
But did humans build it?</i> <i> The strongest evidence
are those angles and steps.</i> <i> They seem too perfect
to be formed by nature,</i> <i> at least to our eye.</i> <i> But it turns out
that can happen naturally.</i> These are the sorts of things
that geologic formations can break into <i> because of earthquakes
or tsunamis,</i> <i> as they move.</i> <i> Those plates break</i> <i> in very, very geometric forms.</i> <i> There's no reason to believe</i> <i>that they had to be cut by man.</i> [Harris]<i> If this is all natural,
wouldn't we expect to see</i> <i> similar structures
all over the planet?</i> [Barnhart]<i> This site
is a geological phenomenon.</i> <i> I don't know of another area
where that large of stones</i> <i> have been moved
in that kind of formation.</i> But that
does not make it a structure. [Harris]<i> One big issue:</i> <i> Barnhart says
these massive steps</i> <i> are actually larger
than anything ever sculpted,</i> <i> carved, or constructed
in the ancient world.</i> <i> And even though
this is the most seismically</i> <i> active area
of the entire planet,</i> <i> you'd still expect
to find more evidence</i> <i> of a prior civilization
if one had been here.</i> [Barnhart]<i> These large slabs,</i> <i> you'd expect,
at least in the cracks,</i> to find some sort of evidence
of human occupation, if it indeed was
some sort of sunken place. There's nothing
like that whatsoever. Archeology
calls those things "geofacts." They look like artifacts, but, in fact,
they're naturally formed. Based on Barnhart
and Anderson's expertise, we're going to conclude
that this site is a natural phenomenon. That means it's not
the lost kingdom of Yamatai. Its location is still a mystery. So if you're diving
off the coast of Japan, keep your eyes open. <i> April 2022,</i> <i> in the Papahanaumokuakea</i> <i> Marine National Monument
in Hawaii.</i> <i> The crew of the exploration
vessel Nautilus</i> <i> is live streaming
its adventures</i> <i> when it comes upon
this startling sight.</i> -[woman 1]<i> Wow, look at that.</i>
-[woman 2 and 3]<i> What?</i> [Harris]<i> At a depth
of 3,375 feet,</i> <i> they spot what looks like
a bunch of bricks</i> <i>off to the right of the vessel.</i> -[woman 1]<i> Yeah.</i>
-[man]<i> Weird. Cobblestone.</i> [woman 2]<i>
Oh, yeah, whoa!</i> [Harris]<i> They're astonished</i> <i> and wonder
if they have just found</i> <i> the road to the fabled
lost city of Atlantis.</i> <i> Journalist Eric Grundhauser
explores whether this might be</i> <i> the ruins of that legendary
lost city.</i> [Grundhauser] This video
is really incredible. This is what appears
to be a paved road at the bottom of the ocean. <i> You can see what appears
to be some metrical bricks</i> <i> that look almost manmade,
except it's hundreds,</i> <i> thousands of feet under water.</i> Who would've built
such a structure? <i> The myth of Atlantis
dates back</i> as far as 360 B.C.,
when it was first mentioned in Plato's dialogues. <i> And most people know
of the myth that it disappeared</i> <i> beneath the waves
and the ruins</i> <i> that are still
somewhere under the sea.</i> According to the legends,
Atlantis became so powerful <i> and had waged war</i> on so many
of its neighboring cultures that Zeus himself decided
to sink the nation <i> to make the Atlantians
pay for their hubris.</i> [Harris]<i> Grundhauser
then wonders if this find</i> <i>could be remains of a land mass
swallowed by the sea long ago.</i> Another popular theory
about the origins of this supposed road
are that it is the remnants of a culture that existed
on what is sometimes called the eighth continent,
known as Zealandia. <i> Zealandia broke off
of a much larger supercontinent</i> <i> known as Gondwanaland.</i> Could this bit of road
have belonged to a civilization <i> that existed millions
of years ago,</i> long before Zealandia
fell beneath the waters of the Pacific Ocean. Legends of sunken civilizations
appear in cultures all over the world,
from Japan to Scandinavia. Atlantis,
the island subcontinent, was supposedly submerged
beneath the waters somewhere past Gibraltar. Could that have been
as far away as Hawaii? Let's turn to our experts
to clear the waters. <i> Anthropologist Kathy Strain
dives into Zealandia theory.</i> Zealandia has been submerged
for over 23 million years. Humans were not around
that long ago, so the technology
to build roads like this <i> is only about
a couple thousand years ago,</i> so we know this is
not possible to be related to that continent. [Harris]<i> Of course,
another pre-human civilization</i> <i> could have existed
on Zealandia, and built roads,</i> <i> but we have nothing yet
to corroborate that theory.</i> <i> Next, Strain weighs in
on whether this road</i> <i> could be connected
to the lost city of Atlantis.</i> Ancient cities that had
these kind of thoroughfares <i> always had lots
of elaborate other artifacts</i> <i> along the pathway. You wanted
to show off your wealth.</i> And so you would have
foundations of structures, <i> you would have pillars,
you would have statues,</i> <i>some archways, and those things
would have been very heavy.</i> The wave action,
time would not erase that. You would at least see
some remnants of it. [Harris]<i> So the absence
of other artifacts</i> <i> appears to rule that out.</i> <i> Then what
are we looking at here?</i> <i>NASA geologist Dr. Bob Anderson
has a theory.</i> <i> This is simply a layer
of sulfur on the ocean floor.</i> This is just one area of sulfur
that formed like a road. <i>The yellow is not really a gold
color, it's a yellow color.</i> It was formed coming out
of a hydrothermal vent. We see it on earth,
see it in deserts, <i> we see it wherever the sulfur
deposits are located,</i> <i> especially around volcanoes
or hydrothermal vents.</i> We see sulfur on some
of these deposits on Mars. [Harris]<i> But what about
those strange brick patterns,</i> <i> so reminiscent
of old cobblestone roadways?</i> That's common
in these areas, where you have
a very thin layer that breaks <i> because of something on top.</i> It'll break
into these very nice patterns <i> on the sides. You can see it
on this side too.</i> <i> But when you get
into the center,</i> you'll see it's more
just diffused and broken up, and that's usually because of, that it's an uneven topography
underneath of it that's causing this break. Our verdict?
This substance is just sulfur. Because there are no records
of Atlantis before Plato wrote about it, most scholars believe
the Greek philosopher is responsible
for creating this myth. This might not be
a yellow brick road, but it sure leads your mind
to some fascinating places. <i> 2007, near Traverse Bay,
Michigan.</i> <i> Underwater archeologist
Dr. Mark Holley</i> <i> and his team of divers
are scouring the lake bottom.</i> We were out looking
for a specific shipwreck. <i> It's just flat sand
for as far as you can go.</i> And it's just very eerie. [Harris]<i> Instead of a wreck,
they stumble across</i> <i> something much older.</i> <i> At first glance,
it's just a line of stones,</i> <i> but Holley says
there's more to it.</i> I knew that we'd found something
that shouldn't be there... <i> but we had no idea
what it was.</i> [Harris]<i> One set of stones
forms a circle,</i> <i> and strangest of all,
look at this.</i> <i> One of the stones appears
to have a detailed carving</i> <i> of a mastodon,</i> <i> here outlined with red chalk.</i> <i> Holley estimates
the site was constructed</i> <i> around 10,000 years ago,
before the glaciers melted</i> <i> to create the lake.</i> <i> Of course,
Holley's video goes viral.</i> Almost immediately, <i> people described it
as a fake.</i> Nothing like this
had ever been found in the Great Lakes before. [Harris]<i> Real or not,
the discovery becomes known</i> <i> as the Lake Michigan
Stonehenge,</i> <i> and raises the question,
was it made by the same people</i> <i> who built England's
famed structure?</i> <i> Professor of Anthropology
Michael Masters raises</i> <i> a controversial theory</i> <i> that ancient Europeans
migrated to the Americas</i> <i> long before Columbus.</i> This tool technology,
associated with groups largely in France, <i>indicates that they came across</i> <i> between 20,000
and 15,000 years ago.</i> [Harris]<i> Paleolithic Europeans
in America?</i> <i> While some scholars
are open to the idea,</i> <i> others point out
that ancient Native Americans</i> <i> created
their own astounding sites,</i> <i> like the Mound Builders
in the Mississippi Valley.</i> <i> So who made it and how?</i> <i> And what does it mean?</i> One more thing to ponder: There's a region known
for strange disappearances and anomalous sightings called
the Lake Michigan Triangle. <i> Early reports
put the find there,</i> <i>but Holley now says it's north,
in Grand Traverse Bay.</i> So what do our experts have to
say about this fascinating find? <i> First, we asked
archeologist Peter Campbell</i> <i> if this could all be a hoax.</i> <i> He points to the moss
and algae on the stones.</i> If they had
been placed recently, <i> then there would be
no marine growth</i> <i> on them whatsoever.</i> The formation, as well,
appears to be a genuine archeological site. [Harris]<i> Campbell thinks
the find is ancient</i> <i> and manmade.</i> <i> And if the mastodon carving
is real,</i> <i> it might provide a window
into a long lost culture.</i> It's possible this had some
sort of religious connotation, and perhaps a religious offering
or ritual related to the hunt. [Harris]<i> But still,
how did they carve that image</i> <i> into granite rock?</i> <i> Anthropologist
Kathy Strain says</i> <i> it would've been difficult,
but very doable.</i> So in order to make
a petroglyph, it's a very simple process. It is taking a rock <i> and pecking at the patina
that's on the outside</i> of the target rocks. <i> Granite is a hard substance,</i> but no special tools
would've been needed. Um, rock art appears
around the world <i> using a similar method,</i> <i> and none of those people had</i> anything other than a rock. [Harris]<i> A far as comparisons
to the English Stonehenge...</i> Stonehenge is
a group of rocks <i> put into a circle
for a religious purpose,</i> <i> and were very heavy to move.</i> And we are
still not entirely certain how they accomplished it. <i> The rocks at the bottom
of Lake Michigan</i> are more in a line. [Harris]<i> Take another look
at the arrangement</i> <i> of the Lake Michigan stones.</i> <i> Strain says
it's very revealing.</i> [Strain]<i> This is likely
what we call a drive line.</i> <i> And you use it to herd animals</i> <i> into either over a cliff</i> <i> or into some kind
of fenced area.</i> So it's a very efficient way
of hunting. [Harris]<i> It would be
the oldest drive</i> <i> or hunting line ever found.</i> <i> When the glaciers melted
more than 10,000 years ago,</i> <i> they submerged the site
at the bottom of Lake Michigan,</i> <i> preserving it to this day.</i> <i>And Campbell thinks it could be
groundbreaking in other ways.</i> If this is in fact
a mastodon drawn on this rock, <i> then it is
a monumental discovery,</i> <i> because this would be
the earliest Paleo-Indian art</i> <i> that's been discovered so far.</i> Our verdict? Well, Mark Holley
definitely discovered something manmade-- we think by
early Native American tribes, not early European immigrants. But whether it was built
for hunting or some other purpose, we can't know
until it's studied further.