All language subtitles for Drain.the.Oceans.S02E11.1080p.WEB.h264-TBS_track3_[eng]

NARRATOR: A land
of ancient ruins,

windswept mountains and
deep foreboding lakes.

Scotland is a nation steeped
in myth, legend and mystery.

And no mystery is more
enduring than that of

the Loch Ness Monster.

Imagine if we could
empty the oceans,

letting the world's
water drain away

to reveal the secrets of
sea floors and lake beds.

Now we can.

Using accurate data and
astonishing technology to

bring light once
again to a lost world.

Can a killing field on the
shores of a Siberian lake

shed light on the world's
most famous monster?

OLGA: This is the pelvic bone,
these are the shoulder blades

and vertebrae.

NARRATOR: Can a marine robot
finally uncover the Loch's

strangest secret of all?

And could a long-lost
shipwreck really be a boat

destroyed by Nessie herself?

ADRIAN: When people said that
John Cobb's crash was caused

by the Loch Ness Monster,
in a sense they were right.

[theme music plays].

NARRATOR: 23 miles long
and over 700 feet deep,

Loch Ness is the biggest
body of fresh water in
the British Isles.

100 miles north of the
Scottish capital, Edinburgh,

it slices the
highlands in two.

Many people are
convinced that its deep,

dark waters harbor a
secretive creature.

Now, a new expedition hopes
to solve the mystery of the

Loch Ness monster
once and for all.

And discover whether
it's myth or reality.

CRAIG: In terms of
the mission plan now,

you can see we've dived.

We're already down at
200 meters of water.

I don't think we've
been to this altitude

in Loch Ness before anyway.

ADRIAN: Before.

CRAIG: So this will be the
best resolution achieved

in the Loch to date.

NARRATOR: Scotland's stunning
natural landscape includes

over 30,000 lochs, the
local word for lakes.

And for most of its history,
Loch Ness is just one of them.

But all that changes
in the early 1930s,

when a new road
brings new visitors

and a series of strange
sightings begins,

which culminate in
an image captured by a
visiting English surgeon.

One of the most iconic
photographs ever taken.

ADRIAN: The surgeon's
picture, of course,

is a picture which everybody
in the western world will know.

NARRATOR: Loch Ness has
been drawing fascinated
visitors ever since.

Eight decades later, over a
million tourists are still drawn

to the shores of the Loch every
year, in search of Nessie.

WOMAN: My aunt, you
saw it, didn't you?

WOMAN: Yeah, oh, distinctly.

I don't doubt
there's a monster.

MAN: I saw this hump.

MAN: We saw the head
and the four humps.

It was the very same
color as an elephant.

NARRATOR: No fewer
than 1,000 people

have claimed to
see the monster.

MAN: It was the size
of a yacht hull.

MAN: It looked like a
submarine coming closer and

closer and you could
see the long neck.

NARRATOR: And there's been a
recent surge in sightings.

MAN: So, I saw a dark
shape in the water.

I was out further, towards
the other end of the castle.

Something's moving,
between the trees.

WOMAN: Oh my God, it's moving!

NARRATOR: For many, Nessie
is a sincerely held belief.

Steve Feltham saw
something unusual in 1991.

STEVE: I saw one thing in
the first year of being here.

Something just shot across
the bay in front of me and

you couldn't tell what it was.

You could only see a spray of
water coming off of something,

like a torpedo.

NARRATOR: Steve
was so fascinated,

he set up a full-time vigil.

STEVE: To be honest I thought
all I need to do now is be

ready for the next
time with the camera,

to take that
all-important photograph.

NARRATOR: 28 years later,
he's still waiting.

MAN [over film]: Loch
Ness, on which the eyes
of the world are focused.

NARRATOR: Scientists too
have been drawn to the Loch,

and their experiences have
been just as mixed as Steve's.

MAN [over film]: The hunt
is well and truly on.

NARRATOR: All through
the 1970s and 80s,

major investigations traversed
the Loch in the hope of making

a genuine zoological
discovery.

Most come back empty
handed, but not all.

REPORTER [over TV]: The team
of scientists sweeping the

depths of Loch ness said
tonight they've made sonar

contact with a large
unidentified object.

They described it
as an unusual...

NARRATOR: No sighting has
ever been properly confirmed.

But expeditions like these
inspire naturalist Adrian Shine.

He's been researching Loch
Ness for more than 40 years.

ADRIAN: Much of the work that
we with the Loch Ness Project

have been doing is biological.

Counting fish, counting
plankton, that sort of thing.

And that's why I
built a submarine.

I recruited students and
that's why we collaborate

with so many universities.

But inevitably we've become
also intrigued by other

aspects of Loch Ness.

NARRATOR: And no other
aspect intrigues Adrian more,

than the biggest
question of all.

Now, he's teamed
up with Craig Wallace,

an expert in deep
water exploration.

They're on board the
research boat Deep Scan,

hoping to reveal what's
inside Loch Ness in

greater detail than ever before.

And even if they don't
find the monster,

Adrian believes that 21st
Century technology can explain

what it is that people
have been seeing.

CRAIG: We've got a vertical
range of 14 meters.

ADRIAN: So you've got
a very high resolution.

CRAIG: Very high resolution.

We're actually gonna drop
down further to eight meters
so we're gonna double it again.

ADRIAN: Okay. Okay.

NARRATOR: To find a monster,
perhaps you need a monster.

At the heart of this
expedition is this robotic

underwater vehicle, armed
with the latest sonar,

it can even adjust its own
course to avoid obstacles.

It's called Munin.

CRAIG: It's only now that
technology's getting up to

that level where we can put
vehicles in autonomously,

where they're making
decisions on their own,

which allows you high
accuracy navigation.

NARRATOR: The first thing Adrian
and Craig want Munin to do

is to take a really close look
at the bottom of the Loch.

CAPTAIN: Clear.

Prop, we're testing the prop.

NARRATOR: As it travels
through the water,

Munin sends signals that
reach 700 feet down.

Some believe there might
be a huge cave there,

the perfect spot for a large
creature to hide inside.

If there is a cave, it will
show up as the signals bounce

back to Munin and the
receiving systems on the
research vessel.

And if Munin was to detect not
just a cave, but a monster,

what would it be like?

The photograph that created
the most popular image

looks like a dinosaur.

But could a dinosaur really
exist in the Scottish highlands?

The country's dramatic
landscape is made up of some

of the oldest rock
layers in the world.

And embedded in them are
thousands of extraordinary

dinosaur fossils, which have
long drawn scientists to the

country, including
Dr. Steve Brusatte.

STEPHEN: In the lagoons and
long the rivers and the lakes,

you would have had dinosaurs.

These kind of animals did
indeed live in Scotland.

There were sea monsters here.

NARRATOR: But the question is,
are there any sea monsters now?

The last known large dinosaurs
in Scotland went extinct with

the rest of their relatives
66 million years ago.

And extinct animals don't just
suddenly reappear, or do they?

In 1938, a fish caught off
the coast of South Africa

shakes the scientific world.

The coelacanth has long
been thought to be extinct.

It had previously only ever
been seen in fossils over

70 million years old.

But the coelacanth,
it turns out,

has been hiding
in plain sight.

Could something similar
have happened in Loch Ness?

A supposedly extinct
prehistoric beast, lurking,

hidden from view,
in his peaty waters.

For this to be even possible,
the Loch Ness we know today

would have to be a
very ancient lake.

A lake from the time
of the dinosaurs.

So is it?

To find out, we'd need to peer
into the deepest recesses of

the Loch and examine
its very bedrock.

But over 700 feet down,

Loch Ness is too deep
for most divers.

Instead, we have Munin, which
has now completed its scans,

giving us the data we need to
drain the waters from the Loch.

Slowly, the Loch's
true scale is revealed.

With steep side walls
plunging down, at its base,

there are no signs
of any caves.

Instead, just a barren plain
of soft, deep sediment.

But with our new data we can
peel the sediment back too,

to reveal in the
depths of the Loch,

a glistening layer
of glacial clay.

Clay that can give us a more
detailed understanding of the

Loch's history and
whether it could hold

a prehistoric monster.

For decades, scientists
are intrigued by these

ancient layers at the
bottom of the Loch,

and drill into the lake bed
to extract core samples.

ADRIAN: That is a time capsule
of events within the Loch.

NARRATOR: They study
the core samples.

And calculate that the
layer of clay marks the

end of the last ice age.

ADRIAN: So we've
got a problem,

Loch Ness was one big ice
cube until 10,000 years ago.

NARRATOR: The dinosaurs went
extinct long before then.

And even if some had somehow
managed to survive in Scotland,

they could never have
lived inside an ice cube.

STEPHEN: There's just no
way that any of these
170 million year old

Jurassic animals could have
ever lived in that lake.

NARRATOR: So if a monster
does inhabit the Loch,

it's not a dinosaur.

So what could it be?

Perhaps there's a clue in
another famous sighting.

In the spring of 1933, hotel
manager Aldi Mackay and her

husband John are driving along
the shore of Loch Ness when

suddenly they see something
moving through the water.

The couple watch amazed
for a full minute,

as what seems to be a creature
rolls around in the center of

the Loch and churns up
the water around it.

Later, Aldi tells a
reporter than the creature
looked like a whale.

Her story becomes front page
news all around the world.

Aldi took no photographs,
but in subsequent decades,

other sightings seem to match
this whale like description.

So could the monster really
be a huge marine mammal?

The problem is there is no
swimmable route from the sea

to Loch Ness.

And even if a whale like
creature could get into the

Loch, there's a
bigger obstacle.

Any saltwater beast would surely
die in a freshwater lake.

Or would it?

The answer to this question
may lie somewhere else,

in the deepest and oldest
lake in the world.

NARRATOR: At almost 400 miles
long, up to 49 miles wide,

and in places a
full mile deep,

Lake Baikal is at least
25 million years old.

4,000 miles away from Scotland,

this mega lake is so colossal,

it can hold 3,000 times
more water than Loch Ness.

And still have room
for a few monsters.

Local folklore claims that
a dragon like creature

inhabits these icy waters.

But it's not dragons
that local scientists
have been studying...

instead they've made a series
of startling discoveries that

might help solve the mystery
of how a sea mammal could

thrive back in Loch Ness.

In the winter months, if local
people want to cross Baikal,

they don't go around the lake,
they just drive over it.

On ice that's up
to five feet thick.

Olga Goriunova is part of a
joint Russian Canadian team

that's been excavating
on the western shore.

OLGA: Usually when you
deal with research along
the shore of Lake Baikal,

people tend to focus on
the ecology aspect only.

The landscape.

The wildlife and so on,
and all the surroundings.

NARRATOR: Olga has made
a special study of an
ancient community

that created Stone Age art
here over 4,000 years ago.

Some of the creatures
they drew look familiar,

but they're not Loch Ness
monsters or even dragons.

Olga has a less
fanciful explanation.

OLGA: Here we have swans.

This is a more
ancient drawing.

And here we can see
groups of swans.

NARRATOR: Along the lake's
shore is a site that plays a

crucial role in the
lives of these people.

OLGA: The oldest layer
of this site is more
than 9,000 years old.

Here, we have a stack of dark
layers dating back to the

Neolithic period, or
the new Stone Age.

NARRATOR: Olga believes that
the ancient community here

used this place as a
Stone Age slaughterhouse.

OLGA: This is
very interesting.

Here, the wall collapsed,
revealing bones.

Look, this is the pelvic bone.

These are the shoulder blades
and here is a vertebrae.

NARRATOR: So what's
all this got to do with

the Loch Ness monster?

The connection is a creature
that these ancient humans were

butchering on the shores
of the fresh water lake.

To find it, we must
first drain Lake Baikal.

As the ice cracks and melts,

trillions of gallons of
freshwater flood out.

And an unseen
landscape emerges,

with vast quantities of
sediment piled high on the

immense lake bed.

But if this sediment
is also pulled back,

it reveals of evidence of
thousands of years of hunting.

Bones everywhere with all
their meat hacked off.

It quickly becomes
obvious that one animal
above all predominates.

A sea creature that's familiar
to anyone in Scotland.

Seals.

In every other
place on the planet,

seals are a saltwater creature.

But the bones here
belong to the nerpa,

a remarkable species of
seal that uniquely evolved

to live in fresh water.

But how did they first get
here, over 1,000 miles

from the saltwater
of the sea?

One possible explanation
is that 300,000 years ago,

Baikal may have been
connected to the Arctic Ocean,

but when the connection was
broken, the seals were trapped

and so had to adapt.

Could something similar
have happened in Loch Ness?

Large sea creatures finding
their way to an inland lake

and then evolving
to live there?

Glacial geologist Jeremy Everest
uses the latest technology

to study landscapes and the way
they can change over time.

With an array of
computing power,

geologists can now model the
area of Scotland around the

northern end of the
Loch in fine detail.

Jeremy also uses an
interactive 3D model that

works like a hologram where he
can play scientific Moses with

a wave of his hand.

JEREMY: I can hold my hand
over the model and it'll rain,

so I'm filling the, filling
the ocean and raising the

local sea level.

NARRATOR: So what happens if
the water continues to rise?

For example, at the
end of an Ice Age.

JEREMY: Sea levels rise
because all the ice is melting

and draining the waters
back into the oceans,

allowing water to
cross this area of land
and enter Loch Ness.

There we have a marine
incursion with sea water

draining into the Loch.

NARRATOR: And if the
land barrier disappears,

could a creature like a
whale swim between the two?

Lake Baikal proves that salt
water animals can adapt to

live in fresh water.

So a whale like creature
entering the Loch at this time

might not be an impossibility.

Although many geologists,
including Jeremy, are
highly skeptical,

and finally there's
another problem.

Whales and seals are
mammals and breath air.

If one was in the Loch today,
every time it came up for air

it would be spotted.

So large sea mammals cannot
be the explanation for

the Loch Ness Monster.

If she isn't a dinosaur
and can't be a whale,

what could explain one of the
most famous sightings of all?

In 1936, Malcolm Irvine
becomes the first person to

film a huge indistinct creature
swimming against the current.

Many sightings since have
described a large animal doing

the same, pushing against
the wind and water.

ADRIAN: You will see a tree
trunk or log out on the Loch,

but then you realize
it isn't, it can't be.

It can't be.
It's swimming.

It's swimming
against the wind.

NARRATOR: Surely nothing
but Nessie could ever move

through water like this.

NARRATOR: If you want
a sense of just how
strange lakes can be,

the biggest lake in the world
is a good place to start.

Lake Baikal's own resident
water dragon tends to get

blamed whenever anything
unusual happens here,

and in 2009, something
totally extraordinary happens.

Astronauts aboard the
International Space Station

observe giant circles,

huge rings carved into the ice.

They are over two and a
half miles in diameter.

And so bizarre that it's
not just the water dragon

that gets blamed.

ALEXEI: People started to
speak about flying saucers,

fairy rings, or
underwater civilizations.

So it looks so strange
and so unusual.

NARRATOR: Alexei Kouraev
is studying the circles
scientifically,

trying to work out
what causes them.

Might what he discovers
shed light on those strange

sightings back in Loch Ness?

The most obvious thing about
the rings close up are gas

bubbles trapped in the ice.

At first, experts wonder
if this means the rings are

connected to giant underwater
gas vents that Alexei knows

are on the lake bed.

He sends a remotely
operated vehicle, or ROV,

under the ice to see if the
bubbles and rings are linked.

But deep in the lake, the
water's so dark it's almost

impossible for him
to see anything.

But we can.

Using the data from Alexei's
ROV to drain part of the lake

that's known to contain vents.

As vast volumes
of water vanish,

the steep lake sides
plummet a mile down.

And now, daylight shines
on the massive expanse

of the lake bed.

Huge rocky cliffs travel
along its length, evidence of

the giant seismic rift that
first created Baikal.

Near the rift, raised areas.

The vents.

These are mini volcanoes.

Holes in the earth's crust
that spew out hot gasses

into the icy waters.

But there's a further mystery,

the sites of the vents
bear no relation

to the sites
of the giant rings.

So they can't be causing them.

From the air, the surface
of this immense lake looks

utterly still and inert.

But recent research by Alexei
is showing that under the ice

it's a different story.

ALEXEI: Baikal is covered
for several months by ice.

One may think that
it's sleeping,

but actually it's
quite the opposite.

So by cutting a
hole in the ice,

it gives you a kind of window
to this underwater world.

NARRATOR: Alexei is
sending down the ROV,

to study how water
behaves in Baikal.

As it descends, it monitors the
density and speed of currents,

to create a three-dimensional
image of the water.

His work has deepened our
knowledge of how Lake Baikal

actually works, revealing
that under the ice,

the water is in turmoil.

ALEXEI: So it's a huge mass of
water with several hundreds of

meter high, which is
in constant rotation.

NARRATOR: As cold winds
blow over the lake,

they chill the top
layers of water.

These then sink and
warmer layers below rise,

creating immense currents
which eventually form

powerful spiraling eddies.

ALEXEI: When you know
where the eddies,

most probably the ice
rinks will develop.

NARRATOR: The eddies, with
their powerful columns of

warm water, corkscrew around...

thinning the ice above them
and forming great rings.

So huge, they can
be seen from space.

Could Loch Ness contain forces
just as strange and surprising

as those in Baikal?

And if so, might they account
for some of the most common

monster sightings of all,

the ones that swim
against the current.

WOMAN: Oh my God, it's moving.

NARRATOR: When the summer
sun heats the surface,

it creates a thin layer of
warm water on top

of colder, denser
water underneath.

When the wind blows, it
pushes that warmer layer

up the length of the Loch.

When it reaches the far end,
it bounces back down the Loch,

moving in the opposite
direction to the cooler water

underneath it.

ADRIAN: Invisible at the
surface, huge waves fall.

They are very slow
but they are very big.

They are over 100 feet high.

NARRATOR: With invisible
waves rebounding up and
down the Loch,

big objects carried
by the top layer,

create the illusion that
something is swimming

against the wind.

ADRIAN: That is a perfectly
rational deduction,

that a piece of material is
seen to have a slow motion

against the wind, and hence
thought to be swimming.

NARRATOR: Scientists are
convinced this phenomenon can

explain Malcolm Irvine's
sighting of a creature

moving against the current.

But there is still one
type of sighting that

remains unexplained.

One of the most common of all.

Many people have claimed to
see something that looks like

a giant multi-humped creature,
wriggling across the Loch.

The first person to study
the monster seriously,

Rupert Gould, concluded from
these sightings that Nessie

must be a sea serpent.

So, are all the people who
claim to see this just deluded?

Or could an extraordinary new
discovery by Adrian and his

crew prove that they are seeing
something real after all?

NARRATOR: Adrian and Craig are
on the second part of their

mission to scan Loch Ness.

This time, they're on the
hunt for a tragic shipwreck,

lost for almost 70 years.

In 1952, national hero John
Cobb is determined to attempt

the world water speed record.

MAN [over film]: He climbed
into the cockpit of a

6,000 horsepower
hydroplane, The Crusader.

Loch Ness in Scotland, the
habitat of a legendary sea

serpent, had been chosen as
the ideal spot for the planned

record breaking time trial.

NARRATOR: But as the jet
engine that powers his boat

pushes it over 200
miles per hour...

disaster.

The Crusader explodes and
John Cobb is killed instantly.

Only small pieces of
debris are ever recovered.

Where is the rest of the boat

and the giant engine
that powered it?

And what caused the crash?

Believers have long
speculated that the
monster could be to blame.

The crash took place on the
eastern end of the Loch,

and it's here Adrian
and Craig will scan.

It's not the first time Adrian's
looked for The Crusader.

In July 2002, using the
remotely operated vehicle,

his team finds what they
believe to be a debris field.

But 700 feet down, visibility
is so poor there's no way of

knowing if this
really is Cobb's boat.

Now they're back.

Using Munin's advanced
scanning technology,

to find out if this is
indeed the last resting
place of The Crusader.

CRAIG: So here is the
mission we planned,

and you can see that this is
really tight line spacing,

giving us the best possible
chance of finding that engine.

ADRIAN: It really is.

CRAIG: We've dropped down
very close to the sea bed,

so the size scanner is
running at 600 kilohertz.

ADRIAN: 600, that's very high.

CRAIG: And we're, so
it's the best possible
solution we can have.

NARRATOR: Cruising
close to the crash site,

the underwater robot
passes back and forth,

constantly scanning
whatever is below.

With the data
successfully on board,

the team analyzes the results.

CRAIG: What I'm seeing is
something much larger than

we previously thought.

Something here
worth investigating.

ADRIAN: There certainly is.

CRAIG: Let's process
some of the data.

So once it's processed,
what you get here,

we can take a look at
this in three dimensions.

So the same site
gives us this.

ADRIAN: Oh well.

That looks like Crusader,
and I am amazed.

NARRATOR: If they've
discovered the Crusader,

it could be
historically important,

revealing details of the
crash for the first time.

To be sure, we need to remove
the dark waters of Loch Ness

from above the wreck.

As the loch empties,
a remarkable sight.

The debris field.

Scattered pieces of aluminum
blown apart by explosive power.

As light hits what appears to
be the broken aluminum hull,

it's clear half the
boat remains intact.

Including one of
its stabilizers.

And a huge jet engine runs over
a third the length of the boat,

much bigger than you'd expect
on any regular speed boat.

It's the proof they've
been looking for.

It's the Crusader.

But can they solve the
mystery of why it was wrecked?

And why some people
believe that Nessie

could have played a role.

ADRIAN: After the accident,
there were speculations that

it was the wake of
the Loch Ness Monster.

NARRATOR: Adrian and Craig go
back to the original footage

and analyze the
crash frame by frame.

And spot something unusual.

ADRIAN: That's interesting.

I think we should look
at the other side, yes.

Right.

Now this is different.

CRAIG: This is from
the other side, looking
from the west shore.

ADRIAN: There is an
oscillation taking place.

CRAIG: Yeah.

ADRIAN: He's thrown
backwards and forwards,

backwards and forwards.

CRAIG: So she's still fully
in control as she crosses the

measure mile.

ADRIAN: She's in control,
but she's oscillating.

CRAIG: He's started
to slow down,

the camera's slowly
catching there.

ADRIAN: And down goes the bow
and immediately you see this

plume go out.

CRAIG: Yeah.

ADRIAN: And there we go.

NARRATOR: Analysis of
the footage reveals
Crusader hits waves.

But this is puzzling.

There shouldn't
have been any waves.

Cobb and his team know that
they can only conduct speed

trials on those rare days when
the Loch is absolutely calm.

They delay their record-breaking
attempt until the wind

has dropped and the Loch is
so calm it's like a mirror.

So where does the
mysterious wave come from?

Adrian thinks there's
something else on the bottom

of the Loch that could help
answer the question of why

waves big enough to destroy
a boat can suddenly appear in

Loch Ness, as if from nowhere.

NARRATOR: People have lived
around Loch Ness for centuries.

But there were hardly any
sightings of a monster until

the 1930s, when the
numbers explode.

Why the sudden increase?

Adrian believes that
another wreck at the
bottom of Loch Ness

may help explain,
and shed light on

the tragic fate of John Cobb.

The Pansy is an
ocean-going fishing boat,

built at the turn
of the 20th Century.

She has a 60 foot main mast,
two feet thick at the base.

But what is an ocean-going
vessel doing in Loch Ness?

In 1803, construction begins
on an ambitious project to

link the Lochs of the Great
Glen into a 60 mile passage

from sea to sea.

The Caledonian Canal.

With this waterway in place,
fishing fleets can now cross

through its canal locks
quickly from one side of
Scotland to the other.

ADRIAN: Thousands once moved
through Loch Ness from the

east to the west
coast fishing grounds.

NARRATOR: One of those thousands
of boats is the Pansy.

Perhaps it can now offer
up a clue to the surge
in monster sightings.

CRAIG: So, we're gonna pass
the Munin really close right

over the top of Pansy, so
we can get the best possible

three-dimensional
representation of the wreck.

NARRATOR: The Pansy sinks
near the center of the Loch,

close to an area
called Foyers.

It's here where Munin is
completing its final scan.

CRAIG: If we zoom in
here, wow, look at that.

Now I'm starting to
see some extra footage.

ADRIAN: You have the
most classic form.

Look at that deep four foot
and that digs into the water

and allows the vessel to
tack against the wind.

Look at the rudder there
on that sharp stern.

NARRATOR: Using Craig's
incredibly precise data,

we can drain the waters
around the wreck of Pansy,

to show the Loch bed here
in extraordinary detail.

Revealing the fishing
boat for the first time
in almost 100 years.

Gently resting on the Loch
bed, she's remarkably intact.

Including the crutch on which
the huge mast once rested.

But the data reveals
something unexpected.

A missing piece.

ADRIAN: Where's the mast?
CRAIG: Yeah.

ADRIAN: If there's no mast
then how did she get about?

CRAIG: Yep.

NARRATOR: Returning to
the drained wreck site
reveals the answer.

Inside her wooden
hull, an engine.

ADRIAN: The boat was built
in 1903, but in 1909,

an auxiliary motor was fitted.

A 40... a 48 horsepower
Thornycroft.

NARRATOR: Pansy didn't
have a mast because she

no longer needed one.

The installing of a
Thornycroft engine allowed

her to move between
fishing grounds,

even in dead calm weather.

And this simple advance in
technology may help explain

how a wave could suddenly
come from nowhere,

as it did so disastrously
for John Cobb.

ADRIAN: If the
water goes calm,

a sailing vessel goes
nowhere, it is becalmed.

NARRATOR: To be able to sail,
a sailing vessel requires wind,

and wind can disturb the
water so completely you

can't see a boat's wake.

But with the advent
of motor power,

boats can travel back and
forth across Loch Ness,

in dead calm,

leaving an unbroken and
visible wake behind them.

It's now that Loch Ness
itself turns these wakes into

something remarkable.

Its steep sides and unusually
straight shape mean that wakes

created by boats
can last for hours,

moving up and down the Loch,
miles from any visible boat.

ADRIAN: If you're
looking across the Loch,

the vessel having made it
will have gone a mile or more

before that, that
wake hits the shore.

NARRATOR: Despite
Cobb's precautions,

the likely explanation for
his crash is that his lightly

built speed boat hit
a long lasting wake,

perhaps from one of his
own support vessels.

ADRIAN: They can travel
for miles in calm water,

where they're not broken up.

At 200 miles an hour, any
wave is going to damage a

lightly built vessel
like Crusader.

NARRATOR: The unexpectedly
strange behavior of water and

currents in Loch Ness may also
explain that strangest of all

phenomena in the
Loch, the monster.

From above, they
are simple wakes.

But side on from the shore
line, the monster appears.

ADRIAN: And that wake,
observed from a low angle,

actually looks very solid.

MAN: See, look, what's that?

What is that?

NARRATOR: Just as Cobb's vessel
was likely hit by a wake,

the many people who think
they see a humped serpent

wriggling in the Loch

may in fact be seeing
nothing more mysterious

than the watery signature of
a boat that's many miles away.

ADRIAN: Have we solved
the Loch Ness mystery?

Well, there will be a Loch Ness
Monster as long as we want one.

NARRATOR: Draining Loch Ness
reveals a possible scientific

explanation of one of the
world's greatest mysteries.

But for the excited visitors who
still come in search of Nessie,

and the hundreds who
claim to catch a glimpse of her,

the monster remains
alive and well.

Captioned by Cotter
Captioning Services.