♪♪
Narrator:
  FOR THOUSANDS OF YEARS, MOST
  SHARK SPECIES RULED THE DEEP.
BUT THE SHALLOWS JUST GOT
     A LITTLE MORE CROWDED.
AROUND THE WORLD,
REPORTS OF SHARKS
    MOVING INTO SHALLOW WATER
ARE MAKING HEADLINES.
SHARK SIGHTED
...ONE BEACH, TWO ATTACKS
  90 MINUTES APART.
-DUDE! GET OUT!
       -GET OUT THE WATER!
GREAT WHITE SIGHTINGS OFF
         THE EASTERN SEABOARD...
OH, THAT'S A SHARK!
Reporter: EXPERTS SAY THAT
      UNUSUALLY WARM WATER
IS LURING DOZENS OF GREAT WHITES
  AND HAMMERHEADS TO THE COAST.
Narrator: NOW, RESEARCHERS
  ARE LOOKING INTO THE SCIENCE
BEHIND THESE HEADLINES...
WOW. HE HIT THE CAGE!
Bolte: COMING IN HOT
             TOWARDS THE DECOY.
...TARGETING HAMMERHEADS
       AND GREAT WHITES...
SHARK, SHARK, SHARK!
...AND USING THE MOST ADVANCED
   SHARK CAGE ON THE PLANET...
HE'S COMING RIGHT AT ME!
...THEY WILL TRACK SHARKS
          IN REAL TIME
AND USE
    SPECIAL LOW-LIGHT CAMERAS
TO CAPTURE SHARK ACTIVITY...
THEY'RE EVERYWHERE!
...AFTER THE SUN GOES DOWN.
HE'S RIGHT ON TOP OF ME.
TOGETHER, THEY'LL WORK
       TO DISPEL THE HYPE
AND REVEAL THE TRUTH BEHIND...
OH, MY GOD!
...THE SHALLOW WATER INVASION.
RIGHT NOW, ONE OF THE LARGEST
   SHARK STUDIES IN THE WORLD
IS TAKING PLACE AT THE REMOTE
      ISLAND OF GUADALUPE.
Johnson: SO,
IN CERTAIN AREAS OF THE WORLD,
THESE WHITE SHARKS
 CAN TAKE ADVANTAGE
OF THE MURKY, MESSY WATER.
BUT HERE, THEY REALLY HAVE
TO TAKE ADVANTAGE OF THE DEPTH.
Hoyos: EXACTLY.
            THEY ARE VERY SMART.
SINCE THEY KNOW
       THAT VISIBILITY IS GREAT,
THEY REMAIN VERY CLOSE
                TO THE BOTTOM
IN ORDER TO AMBUSH
                 THEIR PREY.
THE WATERS
     AROUND GUADALUPE ISLAND
ARE NOT WHAT YOU
       WOULD CALL SHALLOW.
JUST A FEW HUNDRED YARDS
         FROM THE SHORE,
THE DEPTH DROPS OFF
          DRAMATICALLY.
HISTORICALLY,
     RESEARCHERS HAVE FOUND
THAT MOST ADULT
       WHITE SHARKS SPEND
MOST OF THEIR TIME
   HUNTING AT 400 TO 900 FEET.
Johnson: THE ISLAND OF GUADALUPE
IS KNOWN AS
    A FAIRLY DEEP-WATER AREA.
IT'S WHERE THESE WHITE SHARKS
       ARE FOUND IN DEEP,
CLEAR BLUE WATER.
BUT WHAT THEY FOUND RECENTLY
      IS THAT THESE SHARKS
ARE ACTUALLY MOVING
      INTO SHALLOWER WATER.
Narrator: OVER THE YEARS,
DR. MAURICIO HAS TAGGED
         OVER 70 SHARKS.
BUT THE DATA WAS COLLECTED
      BY ONLY SIX RECEIVERS
LOCATED IN DEEP WATERS
       AROUND THE ISLAND.
HE WAS ONLY GETTING A SMALL
   SNAPSHOT OF SHARK ACTIVITY.
SO HE'S NOW PIONEERING A TAG
THAT TRACKS SHARKS IN REAL TIME.
-OH, THERE WE GO!
           -IT'S HERE.
AND HE'S DISCOVERED
        SOMETHING THE OLD
DEEP WATER RECEIVERS
       COULD NEVER DETECT.
SHARKS ARE SPENDING TIME
   IN WATER LESS THAN 60 FEET,
EXTREMELY SHALLOW
         FOR THE ISLAND.
Hoyos: THANKS TO TECHNOLOGY,
NOW WE ARE GETTING TO KNOW
   A LOT ABOUT THESE ANIMALS.
BUT I THINK THAT
       THE BIGGEST MYSTERY
ABOUT THE WHITE SHARK
       IS IN THE SHALLOWS.
WHERE DO THEY COME?
        WHERE DO THEY GO?
DO THEY STAY
     IN THE SPECIFIC PLACES?
DO THEY GATHER?
  ARE THEY PATROLLING THE AREA?
ARE THEY JUST RESTING?
         WE DO NOT KNOW.
Narrator: 60 FEET OF WATER
      MAY NOT SEEM SHALLOW.
BUT IT'S A HUGE DIFFERENCE
     COMPARED TO THE TYPICAL
HUNTING DEPTHS SCIENTISTS
  HAVE DOCUMENTED IN THE PAST.
AND IT FITS A PATTERN
    SEEN ALL OVER THE WORLD.
[ INDISTINCT CONVERSATIONS ]
HOLD ON! LET ME GET
  A DIFFERENT SHOT.
WE GOT TO TAKE CARE OF IT.
REPORTS OF SHALLOW WATER
SIGHTINGS HAVE BEEN
     INCREASING SINCE 2013.
EVERYBODY,
    GET BACK NOW!
CAPE COD MADE
       NATIONAL HEADLINES
BECOMING A WHITE SHARK HOT SPOT.
AND MOST RECENTLY, ON THE COAST
     OF SOUTHERN CALIFORNIA,
THE WATERS AROUND
         MANHATTAN BEACH
WERE ROCKED BY A VISITOR
         FROM THE DEEP.
EVERY BEACHGOER'S WORST FEAR --
       A YOUNG MAN BITTEN
BY A GREAT WHITE SHARK.
Narrator:
    SOON AFTER THIS INCIDENT,
SCIENTISTS
    AT LONG BEACH UNIVERSITY
BEGAN A NEW STUDY.
SO WE NOW KNOW THAT,
 BETWEEN MAY AND ABOUT OCTOBER,
WE'LL GET THESE
       SMALL WHITE SHARKS
LITERALLY NO MORE THAN 100 YARDS
       OFF THE SHORELINE.
Narrator:
  OVER THE NEXT SEVERAL YEARS,
CHRIS LOWE AND HIS TEAM
WILL STUDY GREAT WHITE MOVEMENTS
ALONG THE COAST OF CALIFORNIA.
Lowe: SO SOME OF OUR NEW,
   EXCITING UPCOMING PROJECTS
ARE OUR USE OF
 AUTONOMOUS UNDERWATER VEHICLES
TO TRACK TAGGED FISH.
USING THIS NEW TECHNOLOGY,
WE ARE ABLE TO HAVE ROBOTS
  THAT WE CAN PUT IN THE WATER
THAT WILL GO OUT
  AND FOLLOW AND TRACK ANIMALS.
Narrator:
  MAURICIO'S BRAND-NEW TAGS ARE
   GIVING HIM SIMILAR RESULTS,
BUT HE'S JUST AT
   THE BEGINNING OF HIS STUDY.
Johnson: IS THAT THE ONE
THAT YOU WOULD CALL CHUGGY?
CHUGGY IS A MALE GREAT WHITE,
ABOUT 16-FEET LONG,
THAT HAS AN IDENTIFYING CUT
 ON THE UPPER PART OF HIS TAIL.
MAURICIO HAS SEEN HIM AT
THE ISLAND EVERY YEAR SINCE 2006
AND RECENTLY TRACKED
         HIS MOVEMENTS.
CHUGGY, LIKE MANY OTHER GREAT
    WHITES AROUND THE WORLD,
HAS BEEN PATROLLING
         SHALLOW WATER.
MAURICIO WANTS TO FOLLOW HIM
    AND CATCH HIM IN THE ACT
USING A SELF-PROPELLED
 SHARK CAGE CALLED THE EXPLORER.
ALL RIGHT.
            SO, TODAY'S THE DAY.
LET'S DO IT, MAN.
THE INITIAL PLAN IS TO FOLLOW
       A SHARK LIKE CHUGGY
AS HE MAKES HIS WAY
      TOWARDS THE SHALLOWS,
HOPING TO CATCH A GLIMPSE
OF WHAT'S DRAWING
  GREAT WHITES CLOSE TO SHORE.
Massyn: USUALLY, WHEN YOU'RE
      AROUND GREAT WHITES,
YOU'RE STUCK TO A SHARK CAGE.
YOU CAN'T REALLY GO ANYWHERE,
    AND YOU CAN ONLY OBSERVE
WHAT'S HAPPENING RIGHT
        IN FRONT OF YOU.
THE EXPLORER ALLOWS US TO CRUISE
WHEREVER WE WANT
      AND FOLLOW THE SHARKS
TO REALLY SEE WHAT THEY'RE DOING
   WHEN WE'RE NOT AROUND THEM.
Narrator:
 MAURICIO AND GRANT WILL FOLLOW
 THE EXPLORER WITH A CHASE BOAT.
DEVON, DEVON, DO YOU COPY?
WHILE DEVON AND THE TEAM
          TRACK CHUGGY
INTO THE SHALLOWS OF GUADALUPE,
ON THE OTHER SIDE
        OF NORTH AMERICA,
ANOTHER SHALLOW WATER
        RESEARCH PROJECT
IS JUST KICKING OFF.
THE GREAT HAMMERHEAD IS AMONG
THE LARGEST SHARKS IN THE OCEAN.
IT GETS TO A MEASURED 20 FEET.
NOW, IF WE WERE TO SEE
   ONE OF THESE ON THE FLATS,
IT WOULD BE VERY RARE.
EVERY TIME I TURN ON A NEWS FEED
    OR LOOK AT THE INTERNET,
IT SEEMS LIKE THERE'S ANOTHER
     STORY ABOUT HAMMERHEADS
MOVING INTO SHALLOW WATERS
      TIME AND TIME AGAIN.
I'M TALKING ABOUT RIGHT UP ON
THE BEACH, LIKE A FOOT OF WATER.
♪♪
Narrator: HAMMERHEADS
    HUNTING IN SHALLOW WATER
HAS BECOME A HOT TOPIC.
Reporter: IT SEEMS MORE AND MORE
  HAMMERHEADS ARE GETTING CLOSE
TO THE SOUTHERN
      CALIFORNIA COAST LINE
AND THE PEOPLE SWIMMING,
SURFING, KAYAKING, OR BOATING
        IN THESE WATERS.
Narrator: IN 2015,
THERE WAS A SPIKE IN HAMMERHEAD
      SIGHTINGS NEAR SHORE,
WHICH LEAD TO BEACH CLOSURES
    AND COMMUNITIES ON EDGE.
FOR NOW THESE WARNING SIGNS
       WILL REMAIN POSTED.
Narrator: TO UNDERSTAND
   MORE ABOUT WHY HAMMERHEADS
COME INTO THE SHALLOWS,
DOC GRUBER IS TEAMING UP WITH
 MARINE BIOLOGIST STEVE KAJIURA.
Gruber:
    STEVE HAS BEEN WITNESSING
SOME REALLY INCREDIBLE BEHAVIOR
        FROM HAMMERHEADS,
AND THIS IS THE PERFECT PLACE
     TO BEGIN THIS STUDY --
SHOWING HAMMERHEADS
   IN SHALLOW WATER IN ACTION.
Narrator: TOGETHER, THEY'RE
   USING A HELICOPTER TO TRACK
HAMMERHEADS IN THE SHALLOWS
        OF SOUTH FLORIDA.
Gruber: OH, MY GOD!
BEAUTIFUL.
OH, THAT'S FANTASTIC.
-WHOA!
-LOOK AT 'EM ALL RIGHT BELOW US.
WHOA!
Narrator: THIS IS A SUPER SCHOOL
       OF BLACKTIP SHARKS.
EACH YEAR, THOUSANDS OF THEM
     FLOCK TO THE SHALLOWS.
AND STEVE BELIEVES
   THE HAMMERHEADS FOLLOW THEM
AND HUNT THEM THERE.
DOC'S PLAN IS TO DEPLOY RUVS,
OR REMOTE UNDERWATER
    VIDEO SURVEILLANCE UNITS,
TO CAPTURE FOOTAGE
       OF THE HAMMERHEADS
HUNTING IN THE SHALLOWS.
Gruber: A RUV IS LIKE A LITTLE
      SURVEILLANCE SYSTEM.
AND IF DR. KAJIURA'S
        THEORY IS RIGHT,
WE WILL GET SOME FANTASTIC
      VIDEO OF HAMMERHEADS
PREYING ON THESE
        BLACKTIP SHARKS.
Man #1: HERE'S THE HAMMER.
Man #2: HE'S ABOUT HALF THE SIZE
 OF THE SHADOW OF MY HELICOPTER.
SO HE'S, UH...
      HE'S GOT SOME SIZE TO HIM.
OH, HE'S IN CLEAR,
         SHALLOW WATER.
-HOW BIG IS THE HAMMERHEAD?
              -12.
12 FOOT? IS HE, UH,
CHASING SPINNER SHARKS?
YEAH. DYKOKE, THE SHARKS
            ARE STARTING TO HEAD
RIGHT TOWARDS YOU NOW.
HERE COMES ONE.
THERE, THERE, THERE!
THERE'S THOUSANDS OF SHARKS
      AROUND THIS NORTHERLY ONE.
Narrator: THE TEAM'S RUV
     CAPTURES THE HAMMERHEAD
AS IT MOVES INTO THE SHALLOWS,
JUST ABOUT 200 FEET
       FROM THE SHORELINE.
THE RUV CAPTURED THIS HAMMERHEAD
 CLEARLY HUNTING THE BLACKTIPS.
SO, NOW WE WANT TO SEE EXACTLY
      HOW THESE HAMMERHEADS
ARE USING VERY
     SHALLOW WATERS TO HUNT.
SO, WE'RE HEADING TO
  THE BAHAMAS TO DO JUST THAT.
Narrator: WHILE DOC AND HIS TEAM
   GEAR UP FOR THE NEXT PHASE,
UNDERWATER CAMERAMAN
          DEVON MASSYN
IS SEARCHING THE SHALLOWS
       OF GUADALUPE ISLAND
FOR A SHARK NAMED CHUGGY.
Massyn: HOLY...
Narrator: THIS DRAMATIC
DROP-OFF, KNOWN AS THE PINNACLE,
ILLUSTRATES
    THE UNDERWATER LANDSCAPE
THAT IS TYPICAL OF GUADALUPE.
WHOO-HOO-HOO!
THE SHARKS THAT INVADE
    THE SHALLOWS RETREAT BACK
TO THE DROP-OFF
   FOR MANY HOURS OF THE DAY.
OKAY, BE CAREFUL. I HAVE SEEN
          HUGE SHARKS AROUND IT.
WHOA, WHOA, WHOA!
LOOK, LOOK, LOOK, LOOK, LOOK!
LOOK AT THE SIZE
    OF THAT ONE!
OKAY, WE CAN SEE IT.
               WE CAN SEE IT.
IT'S HUGE!
Massyn: HOLY CRAP!
RIGHT THERE,
   YOU CAN SEE IT.
LOOK, LOOK, LOOK, LOOK.
HOLY CRAP!
Narrator: COMING UP...
HE IS REALLY AGITATED.
-WHOA!
       -WHOA, WHOA, WHOA!
Massyn:
   I GOT SOMETHING DOWN HERE!
IT'S SOMETHING
             VERY CLOSE TO YOU.
Reporter: EXPERTS SAY
THAT UNUSUALLY WARM WATER
IS LURING DOZENS OF GREAT WHITES
AND HAMMERHEADS TO THE COAST.
Narrator: AROUND THE WORLD,
SHALLOW WATER SHARK SIGHTINGS
ARE DOMINATING THE NEWS.
NOW, TWO TEAMS ARE INVESTIGATING
        THESE PHENOMENONS
TO FIND THE SCIENTIFIC TRUTH
      BEHIND THE HEADLINES
BY TARGETING
     THE TWO LARGEST SPECIES
TO ENTER THE SHALLOWS --
  HAMMERHEADS AND GREAT WHITES.
♪♪
RIGHT NOW, UNDERWATER
     CAMERAMAN DEVON MASSYN
IS TRACKING CHUGGY,
A 16-FOOT GREAT WHITE
THAT HAS BEEN RECENTLY ENTERING
   THE SHALLOWS OF GUADALUPE.
BUT CHUGGY HAS MADE A 180 BACK
TOWARDS THE DEEPER
       PART OF THE ISLAND,
AND HE'S NOT ALONE.
WHOA, WHOA, WHOA!
LOOK, LOOK, LOOK, LOOK, LOOK!
LOOK AT THE SIZE
    OF THAT ONE!
OKAY, WE CAN SEE IT.
               WE CAN SEE IT.
IT'S HUGE!
LOOK, LOOK, LOOK, LOOK!
Massyn: HOLY CRAP!
CAN YOU SEE
               A TRANSMITTER?
MAURICIO HAS NEVER SEEN
THIS 17-FOOT
       GREAT WHITE BEFORE.
HE'S A GREAT OPPORTUNITY
       FOR MORE RESEARCH.
Hoyos:
  WE ARE VERY EXCITED RIGHT NOW
 BECAUSE WE JUST SAW A BIG MALE,
AND I COULDN'T RECOGNIZE IT.
SO I THINK
     THAT IT'S A NEW SHARK.
IT'S VERY HARD
      TO GET THE BIG MALES,
AND IT'S VERY GOOD
     TO TAG NEW INDIVIDUALS
BECAUSE YOU GET TO SEE
         THE SAME SHARKS
COMING BACK OVER AND OVER.
SO WITH THIS, WE WILL KNOW
 THE PATTERNS OF THESE ANIMALS.
WHEN DO THEY COME?
WE DO NOT KNOW
     IF THEY ARE PATROLLING,
IF THEY ARE SOCIALIZING
       WITH OTHER ANIMALS,
IF THEY ARE MATING.
SO NOW WE WILL BE ABLE
     TO SEE A LOT OF THINGS
THAT NOBODY HAS SEEN BEFORE.
Narrator: THE ULTRASONIC TAGS
         ALLOW MAURICIO
TO FOLLOW THE GREAT WHITES
          IN REAL TIME.
IF HE CAN FIND THIS NEW SHARK,
IT WILL GIVE HIM MORE DATA
  TOWARDS UNLOCKING THE MYSTERY
BEHIND GREAT WHITES
    MOVING INTO THE SHALLOWS.
Johnson: LET'S GET
A BUNCH OF BAIT IN THE WATER,
SEE IF WE CAN DRAW THAT BIG,
BIG MALE UP AND GET A TAG IN IT.
OKAY. LET'S GO.
WHILE THE GREAT WHITE TEAM
         PREPARES A TAG,
IN THE SHALLOWS OF THE BAHAMAS,
DOC GRUBER AND THE SHARK LAB
HAVE ARRIVED
    AT A HAMMERHEAD HOT SPOT.
Massuger:
HOW YOU DOING, MIKE?
Gruber: HAMMERHEADS ARE ADAPTED
       FOR SHALLOW WATER.
THEY'VE EVOLVED IN THAT STATE.
MY QUESTIONS HAVE TO DO
    WITH WHAT THEIR ROLE IS.
HOW DO THEY USE SHALLOW WATER
       TO THEIR ADVANTAGE?
WHAT IS IT ABOUT HAMMERHEADS
THAT MAKES THEM
 SO FORMIDABLE IN THE SHALLOWS?
Narrator: DOC GRUBER IS TEAMING
  UP WITH CAPTAIN MIKE NEWMAN,
AN OCEAN ENGINEER
         AND DIVE MASTER
WHO HAS SPENT YEARS
   WORKING WITH THE SHARK LAB.
-HI. YOU BROUGHT THE RAY.
       -WE GOT THE DECOY.
YEAH.
           DOESN'T IT LOOK REAL?
THE TEAM HAS CREATED
   AN EAGLE RAY DECOY TO STUDY
THE HAMMERHEAD'S PREDATION
    STRATEGY IN THE SHALLOWS.
WE FIRST STARTED THIS HAMMERHEAD
        DIVE ABOUT 10 YEARS AGO,
BUT WE NEVER FOCUSED
             ON FEEDING ECOLOGY.
AND THEY WOULDN'T BE HERE
IF NOT FOR THE EAGLE RAYS
               AND STINGRAYS.
Massuger: WHAT WE'VE BEEN SEEING
   IN THE REALLY SHALLOW WATER
IS LARGE AMOUNTS OF THESE RAYS,
BUT ALSO LARGE AMOUNTS
 OF THESE HAMMERHEADS COMING IN.
THE ONE THING THAT
     WE DON'T HAVE, HOWEVER,
IS VIDEO FOOTAGE
        OF IT HAPPENING.
Narrator: GREAT HAMMERHEADS
         IN THE SHALLOWS
HAVE BEEN MAKING HEADLINES.
LIFEGUARDS AGREE THIS MARITIME
     SITUATION IS EXCITING.
THEY'RE ALSO CONCERNED
      ABOUT PUBLIC SAFETY.
WHILE MANY STORIES
         DOCUMENT SHARKS
STEALING FISHERMEN'S CATCHES,
THERE ARE OTHERS
        THAT CAPTURE THEM
HUNTING RIGHT ON THE BEACH.
Man: BIG HAMMERHEAD!
             GET OUT THE WATER!
THE SHARK LAB BELIEVES
 THAT THE HAMMERHEADS IN BIMINI
ARE COMING INTO THE SHALLOWS
         TO ATTACK PREY,
BUT THEY HAVE NEVER CAPTURED
     VIDEO OF THE PREDATION.
Gruber: WE WOULD REALLY LIKE
       TO GET VIDEO DATA,
CLEAR VIDEO PHOTOGRAPHS,
OF A GREAT HAMMERHEAD
    PREYING ON AN EAGLE RAY.
WE HOPE
    THAT THE EAGLE RAY DECOY
WILL PRODUCE
  IN THE GREAT HAMMERHEAD SHARK
A FEEDING RESPONSE
      THAT IS STEP-WISE --
THE APPROACH, THE BITE,
THE CONSUMPTION,
        AND THE RELEASE.
Newman: SO WE KNOW
THAT THESE HAMMERHEADS
ARE EATING RAYS THEN?
-YEAH.
           -HEY, GUYS.
-WHEN WE GOT A --
 -THERE'S A BIG GIRL RIGHT HERE.
-OH, ALREADY! THAT'S INCREDIBLE!
          -OH, MY GOD.
GUYS, GET READY.
  GET YOUR GEAR ON.
Narrator: WITH A HUNGRY SHARK
          ON THE SCENE,
THIS MIGHT BE THE TEAM'S
     BEST CHANCE TO UNCOVER
HOW THESE SHARKS USE
          SHALLOW WATER
TO THEIR ADVANTAGE.
♪♪
USING A SCOOTER,
MIKE WILL TOW THE DECOY
        THROUGH THE WATER
TO SIMULATE AN EAGLE
        RAY ON THE MOVE.
MIKE, MIKE, MIKE,
  CAN YOU HEAR ME?
ALL RIGHT. THAT DECOY
 LOOKS REALLY GOOD.
IT'S GLIDING
IN THE WATER JUST FINE.
UH, WE'RE GONNA KEEP AN EYE
 ON THE HAMMERHEAD,
SEE WHAT IT'S DOING.
♪♪
MIKE PATROLS THE AREA
         WITH THE DECOY,
HOPING TO ATTRACT A HAMMER.
BUT IT APPEARS THE SHARK
   IS NO LONGER NEAR THE BOAT.
MIKE, WE DO NOT SEE
 THE SHARK ANYMORE.
THE SHARK LAB USES A DRONE
TO LOCATE THE HAMMER FROM ABOVE.
THE DRONE IS GOING
IN THE AIR RIGHT NOW.
Newman: ALL RIGHT.
      KEEP ME POSTED, GUYS.
I DON'T SEE ANYTHING
      DOWN HERE RIGHT NOW.
-CHRIS, YOU SEE IT ANYWHERE?
      -STILL NOT SEEING IT.
Gruber: JACK,
  ABOUT 100 YARDS OFF THE STERN.
SHE'S RIGHT HERE.
Massuger: GOT HER. SHE IS RACING
   IN FROM ABOUT 100 YARDS AWAY.
Bolte: ALL RIGHT, MIKE.
   WE CAN SEE THE SHARK AGAIN.
SHE'S COMING RIGHT
        TOWARDS THE RAY.
SHE'S LOOKING
       REALLY INTERESTED.
SHE'S ABOUT 50 YARDS
 OFF THE PORT SIDE OF OUR BOAT.
Narrator: NOW THAT THE SHARK
       HAS SEEN THE DECOY,
THE TEAM HOPES TO WITNESS
     A HAMMERHEAD PREDATION
IN SHALLOW WATER
       FOR THE FIRST TIME.
Newman: HUH? HERE SHE COMES.
   HERE SHE COMES.
♪♪
MIKE, SHE IS COMING
          RIGHT ON YOU,
RIGHT TOWARDS THE DECOY.
WITH THEIR UNIQUE HEAD SHAPE,
HAMMERHEADS HAVE AMAZING
      STEREOSCOPIC VISION,
ALLOWING THEM TO SEE
       ALMOST 360 DEGREES
WITH PRECISE DEPTH PERCEPTION.
SHE'S SNIFFING AT IT.
               SHE'S INTERESTED.
Bolte: COMING IN HOT.
COMING IN HOT TOWARDS THE DECOY.
LOOK AT HIM!
              HE'S RIGHT THERE.
I SEE HIM. HE'S COMING OVER.
      HE'S COMING RIGHT UP HERE!
WHEW! THAT WAS CLOSE.
ALL RIGHT.
    SHE'S COMING BACK AT YOU.
OH, THE HAMMERHEAD'S
             GOING RIGHT FOR IT.
VERY, VERY GOOD.
OH, SHE'S COMING IN! LOOKS
  LIKE SHE'S ABOUT TO BITE IT!
OH!
SHARK SIGHTED.
ONE BEACH, TWO ATTACKS.
Reporter: A 10-FOOT
GREAT WHITE SHARK RUSHED AT HIM.
Narrator: ACROSS THE GLOBE,
SHARKS IN SHALLOW WATERS
     ARE CREATING HEADLINES.
Gruber: HAMMERHEADS ARE ADAPTED
       FOR SHALLOW WATER.
THEY'VE EVOLVED IN THAT STATE.
AND KNOWING THAT VERY LITTLE
      IS KNOWN ABOUT THEM,
IT'S IMPORTANT TO UNDERSTAND
  WHAT THEIR CAPABILITIES ARE.
IF THE EAGLE RAY DECOY WORKS,
I THINK IT CAN OPEN UP
 A WIDE FIELD OF STUDIES FOR US.
LOOK AT HIM!
    HE'S RIGHT THERE. I SEE HIM.
HE'S COMING OVER.
      HE'S COMING RIGHT UP HERE!
Narrator: FOR YEARS, GREAT
   HAMMERHEADS HAVE BEEN FOUND
WITH STINGRAY BARBS
        IN THEIR MOUTHS.
BUT THE SHARK LAB HAS
    NEVER CAPTURED VIDEO DATA
OF THE ACTUAL PREDATION EVENT.
Bolte:
      OH, SHE'S COMING IN.
LOOKS LIKE SHE'S
        ABOUT TO BITE IT!
OH! ALL RIGHT.
   SHE JUST MASHED THAT DECOY.
SHE IS REALLY AGITATED.
-OHH!
              -OHH!
IT LOOKS LIKE SHE'S
    RIGHT ON THE RIGHT WING.
-WHOA!
       -SHE JUST TOOK IT.
Newman:
    SHE'S RIGHT ON TOP OF ME!
-NICE!
             -WHOA!
Massuger: BOY,
SHE JUST TOO THE WING OFF.
BEAUTIFUL!
-THAT WAS AWESOME.
             -YEAH.
[ CHUCKLES ]
MIKE, HOW ARE YOU DOING
  DOWN THERE? DID YOU SEE THAT?
-ALL RIGHT.
          -ROGER THAT.
WELL, WE'LL BE THERE
       TO GET YOUR STUFF.
SOUNDS GOOD, MAN.
Narrator:
  WHEN HUNTING IN THE SHALLOWS,
HAMMERHEADS REDUCE
         VERTICAL SPACE
AND GIVE PREY LESS
        CHANCE TO ESCAPE.
THEY'RE WELL ADAPTED
     TO HUNT AT THIS DEPTH,
AND THIS COULD BE A CLUE
THAT SHALLOW WATER
       BEHAVIOR ISN'T NEW.
YEAH, MAN. SHE TOOK
  THAT WING CLEAN OFF. HOLY...
Gruber: THE ENTIRE RAY DECOY
    SEQUENCE WAS ASTOUNDING.
FROM OUR OBSERVATIONS,
WHEN YOU GO ON THE FLATS
     AND CHASE AFTER A RAY,
THE RAY HAS FAR LESS
    OF AN ABILITY TO ESCAPE.
IF THE PREY DOESN'T
        HAVE THE ABILITY
TO SWIM 50 FEET UP,
THEN 30 FEET DOWN,
    THEN 40 FEET TO THE SIDE,
BUT CAN ONLY SWIM 2 OR 3 FEET UP
         OR 10 FEET UP,
THAT SHARK'S GONNA
       HAVE A BETTER SHOT.
Bolte:
 STILL GOT EYES WITH THE DRONE.
Narrator: BACK IN GUADALUPE,
      THE GREAT WHITE TEAM
IS STRATEGIZING HOW TO TAG
          THE NEW SHARK
THEY'VE JUST SPOTTED.
Johnson: THE FIRST STEP
       OF THIS EXPEDITION
IS TO TRY TO GET A TRANSMITTER
INTO ONE OF THESE BIG
 WHITE SHARKS AROUND THE ISLAND.
SO WHAT WE'RE GOING TO DO
IS BAIT THEM UP
    TO THE BACK OF THE BOAT,
AND MAURICIO'S GOING TO USE
          A POLE SPEAR
TO IMPLANT A TRANSMITTER WITHOUT
   HAVING TO CATCH THE SHARK.
Narrator: THE TAG'S GPS LOCATOR
       WILL ALLOW MAURICIO
TO TRACK THE SHARK AS IT SWIMS
BETWEEN THE DEEP
        AND THE SHALLOWS.
Hoyos: SO, RIGHT NOW,
            WE ARE TRYING TO SET
AN ULTRASONIC TRANSMITTER
              IN A WHITE SHARK
IN ORDER TO FOLLOW THIS SHARK
        FOR AS LONG AS POSSIBLE.
THAT'S AWESOME.
Narrator:
  MAURICIO AND THE TEAM BELIEVE
THAT IF THEY CAN TAG A NEW SHARK
         AT THE ISLAND,
THEY COULD DISCOVER BEHAVIORS
  UNKNOWN TO SCIENCE UNTIL NOW.
♪♪
THEY HAVE THE BEST CHANCE OF
 TAGGING SHARKS IN DEEPER WATER.
AWESOME! WE HAVEN'T
  GOT A VISUAL YET,
BUT WE'LL BE ON THE LOOKOUT.
THERE'S THE SHARK,
                  BELOW US.
THIS SHARK IS ALREADY PART
     OF MAURICIO'S PROJECT,
SO THE TEAM MUST WAIT
   AND HOPE FOR THE NEW SHARK
THEY SPOTTED
      EARLIER TO REAPPEAR.
TO ENSURE MORE SHARKS EMERGE,
       THEY'RE USING BAIT.
IT'S A TRADE-OFF,
DRAWING THE GREAT WHITES
      CLOSE ENOUGH TO TAG.
Johnson: WHOA, WHOA,
              WHOA, WHOA, WHOA!
WOW!
RIGHT UNDER US.
COMING YOUR SIDE NOW.
WHOA, WHOA, WHOA,
                 WHOA, WHOA!
OKAY, THERE IT IS.
THIS LARGE MALE IS THE PERFECT
       CANDIDATE FOR A TAG
BECAUSE HE IS A NEW SHARK
THAT MAURICIO
    HAS NEVER I.D.'d BEFORE.
HE IS APPROXIMATELY 17 FEET LONG
   AND WEIGHS WELL OVER A TON.
COPY, COPY.
OH, THAT IS A BIG SHARK!
Hoyos: OKAY, IT'S COMING
RIGHT UP TO THE BAIT.
IT'S COMING.
HERE. IT'S COMING.
    IT'S COMING.
HE'S COMING.
[ Chuckling ] WHOA!
        WHOA!
Johnson: YEAH!
Massyn: OH, THIS IS IT.
                 THIS IS IT.
-TAG IT.
             -READY?
EVERYBODY GET BACK NOW!
Narrator: SHARK SIGHTINGS
        IN SHALLOW WATERS
HAVE SPARKED RESEARCH
   PROJECTS ACROSS THE GLOBE.
Man: BIG HAMMERHEAD!
             GET OUT THE WATER!
THE GREAT WHITES OF GUADALUPE
  WERE NORMALLY THOUGHT TO HUNT
AT DEPTHS OF 600 TO 1,000 FEET,
BUT NEW ULTRASONIC TAGS
REVEAL THAT THEY SPEND
        SIGNIFICANT TIME
IN JUST 60 FEET OF WATER,
CONSIDERED EXTREMELY SHALLOW
         FOR THE ISLAND.
Massyn: OKAY. IT'S COMING
           RIGHT UP TO THE BAIT.
IT'S COMING.
    IT'S COMING.
IT'S COMING.
[ Chuckling ] WHOA!
        WHOA.
IT'S COMING. IT'S COMING.
    IT'S COMING.
-YES!
            -GOT IT!
GOT IT!
[ LAUGHS ] GOOD STUFF, MAN.
             RIGHT ON THE SPOT.
THAT'S A BIG MALE.
WITH THIS TAG, THE TEAM
WILL TRACK THE SHARK'S MOVEMENTS
AROUND THE ISLAND IN REAL TIME.
THE HOPE IS THAT
    THEY CATCH IT IN THE ACT
AS IT MAKES A MOVE
FROM THE DEEP INTO THE SHALLOWS.
Johnson:
    THAT WAS A PERFECT SHOT!
Narrator: ON THE OPPOSITE COAST
        OF NORTH AMERICA,
THE SHARK LAB TEAM USES
        A DRONE TO SEARCH
FOR A HAMMERHEAD SHARK
WITH THE LAST FEW MINUTES
          OF DAYLIGHT.
Gruber: EARLIER TODAY,
     WE DID A FEEDING STUDY
WITH THE RAY DECOY.
AND THE REASON
        IT WAS AMAZING IS
BECAUSE IF I WERE TO PREDICT
WHAT THAT HAMMERHEAD WOULD DO,
IT DID EXACTLY WHAT I EXPECTED.
NOW, WE'D LIKE TO FOLLOW ONE IN
AND SEE IF WE CAN SEE
         ANY DIFFERENCES
IN FEEDING BEHAVIOR
     BETWEEN DAY AND NIGHT.
-WHERE'S THE DRONE?
  -WE'RE ABOUT 150 METERS AWAY.
WAIT, LOOK AT THAT.
     LOOK AT THAT. LOOK AT THAT.
YOU SEE HOW QUICK
             IT'S MOVING THERE?
-THAT'S MOVING FAST.
     -THERE'S A DARKER AREA.
-YEAH, THAT'S DEFINITELY A FISH.
    -LET'S DROP -- YEAH, NO.
-YOU CAN TELL BY THE WAY...
      -THAT'S A HAMMERHEAD.
-...THAT THAT'S CHARGING IN.
      -THAT'S A HAMMERHEAD.
HERE HE COMES.
             HE'S COMING TO US.
Gruber: THAT'S A GOOD TURN.
THAT'S A DAMN GOOD TURN.
Newman: HOW FAR AWAY IS IT?
WE'RE 150 METERS
       IN THAT DIRECTION.
CHRIS, LET'S FIRE UP THE BOAT
 AND SEE IF WE CAN GET IN THAT.
-ALL RIGHT. LET'S GET ON HIM.
          -GO, GO, GO.
Narrator: THIS SHARK IS CAPTURED
          ON THE DRONE
IN JUST 6 FEET OF WATER.
HAMMERHEADS HUNTING
     IN THE EXTREME SHALLOWS
IS A MAJOR FOCUS
   OF THE SHARK LAB'S RESEARCH
BECAUSE A LARGE SHARK
     RECENTLY MADE HEADLINES
WHEN IT WAS CAUGHT
      RIGHT OFF THE BEACH.
Reporter:
   A GROUP OF YOUNG FISHERMEN
IN BOCA RATON, FLORIDA,
REELED IN A 14-FOOT
        HAMMERHEAD SHARK
THAT WEIGHED AN
      ESTIMATED 700 POUNDS.
Gruber: THEY MAY COME IN AT
  DUSK, OR ESPECIALLY AT NIGHT,
AND USE VERY, VERY SHALLOW
   WATERS TO THEIR ADVANTAGE.
WE'RE JUST NOT THERE TO SEE IT.
Massuger: THAT HAMMERHEAD
  THAT'S COME IN, I CAN SEE IT.
IT'S RACING AROUND JUST
    AT THE EDGE OF THE LIGHT.
Narrator: WITH A LARGE
    HAMMERHEAD NEAR THE BOAT,
THE TEAM HAS
     THE PERFECT OPPORTUNITY
TO SEE IF THERE'S ANY
  BEHAVIORAL CHANGES AT NIGHT.
THEY'LL USE
     A STINGRAY DECOY AGAIN
TO ENTICE THE SHARK.
MIKE, MIKE, MIKE,
          DO YOU COPY?
Bolte: TO YOUR LEFT.
                TO HIS LEFT.
TO YOUR LEFT, TO YOUR LEFT,
          TO YOUR LEFT.
Narrator:
   EAGLE RAYS USE THE SHALLOWS
    TO REST DURING LOW TIDE,
SO MIKE BURIES THE DECOY
     TO MIMIC THIS BEHAVIOR.
Massuger: SHE'S COMING IN
        FROM THE SHADOWS.
SHE'S COMING IN FROM
           YOUR RIGHT.
MIKE, THAT SHARK IS
  ON THE OUTSKIRTS OF THE LIGHT,
JUST RIGHT ALONG THAT EDGE
          WHERE THE SHADOWS ARE,
HEADING TOWARDS YOU FAST.
                 YOU SEE IT?
OH, SHE'S COMING IN FAST.
SHE'LL BE COMING TOWARDS
     YOU REAL QUICK, REAL QUICK.
YOU SEE ANYTHING?
SHE'S STICKING AROUND. SHE'S
   TURNING QUICK, TURNING QUICK.
Narrator: ACROSS THE GLOBE,
EACH YEAR BRINGS MORE SIGHTINGS
OF LARGE SHARKS
       IN SHALLOW WATERS.
WATCH YOURSELF, GUYS.
               WATCH YOURSELF.
NOW, TWO TEAMS OF SCIENTISTS
   ARE TRYING TO FIND OUT WHY.
AND THEY'RE LEARNING THIS
    BEHAVIOR MAY NOT BE NEW.
Bolte: YOU SEE ANYTHING?
SHE'S STICKING AROUND. SHE'S
   TURNING QUICK, TURNING QUICK.
THE HAMMERHEAD MAY RELY MORE
    ON ITS ELECTROSENSITIVITY
WHEN HUNTING AT NIGHT,
AND IT MAY HAVE REVEALED TO HER
 THAT THIS RAY IS ONLY A DECOY.
Gruber: THE TURNING RADIUS
   OF A GREAT HAMMERHEAD SHARK
IS SO IMPRESSIVE.
YOU CAN SEE CLEARLY
   HOW AGILE THIS SPECIES IS.
IT SWERVES AND TURNS
     AND CAN STOP ON A DIME.
WHEN I SEE THIS TYPE
    OF SWERVING AND TURNING,
I KNOW IT'S IN A HUNTING MODE.
Narrator:
THE MORE DATA THE SHARK LAB GETS
 ON HAMMERHEADS IN THE SHALLOWS,
THE MORE CLEAR IT IS
HOW WELL ADAPTED THESE SHARKS
      ARE TO SHALLOW WATER.
♪♪
THOUSANDS OF MILES AWAY,
      THE GREAT WHITE TEAM
IS STARTING TO DRAW
      A SIMILAR CONCLUSION.
Hoyos: YEAH,
VERY CLOSE TO THE SHORE.
THE FOUR SHARKS TAGGED
WITH NEW ULTRASONIC TRANSMITTERS
HAVE ALL FOLLOWED
       A SIMILAR PATTERN.
-OH, HERE WE GO!
          -LET'S DO IT.
LEAVING THE DEPTHS
      TO HANG OUT IN WATER
CONSIDERED EXTREMELY
     SHALLOW FOR GUADALUPE.
MAURICIO AND THE TEAM ARE NOW
  FOLLOWING NEWLY TAGGED MALE.
Massyn: THAT FULL MOON IS JUST
  LIKE A SPOTLIGHT IN THE SKY.
YES.
THE OCEAN'S JUST LIT UP
           RIGHT NOW.
I BET YOU THEY CAN SEE
A LOT OF THINGS UNDER THE WATER.
YEAH, I THINK THAT THEY
COULD SEE THE SILHOUETTES
OF THE SEALS WHEN
THEY ARE AT THE SURFACE
WHEN THEY ARE UNDERNEATH.
OH, THERE WE GO.
RIGHT IN FRONT OF US.
Narrator:
 THE TEAM LOCKS ON TO A SIGNAL,
AND THE SHARK SEEMS TO BE
     HEADING CLOSER TO SHORE
IN JUST 60 FEET OF WATER.
-IS THAT A SHARK?
             -YEAH.
THIS WILL BE THE PERFECT SPOT.
LET'S GET THE EXPLORER
     INTO THE WATER AND SEE
IF WE CAN GET A SHOT HERE
    IN THE SHADOWS AT NIGHT.
Narrator: USING THE EXPLORER
       AT NIGHT IS RISKY.
[ SPEAKING SPANISH ]
IN THE DARKNESS,
DEVON HAS ONLY SECONDS TO REACT.
BUT IF THE TEAM WANTS TO REVEAL
    WHAT THE SHARKS ARE DOING
IN THE SHALLOWS OF GUADALUPE...
LET'S BE CAREFUL.
 LET'S TRY TO AVOID
THAT THE EXPLORER
DOESN'T BOUNCE A LOT.
...THIS IS THEIR CHANCE.
♪♪
[ DEVICE PINGING ]
DEVON, DEVON, DEVON.
    HOW'S IT LOOKING DOWN THERE?
WHAT ARE YOU GUYS SEEING?
SCIENTISTS BELIEVE SPOTTING
  WHITE SHARK HUNTING ACTIVITY
IN THE DEAD OF NIGHT
       WOULD BE VERY RARE.
OH, OH, OH, OH.
              WAIT, WAIT, WAIT.
STAND BY ONE SECOND, DEVON.
I HAVE ONE.
IT'S GOING TO THE SOUTH.
HEY, DEVON. WE'VE GOT A SHARK
THAT'S ABOUT 25 METERS DOWN.
AND IT'S HEADING
 TOWARDS THE SOUTH.
MAURICIO SAYS THE SHARK
   IS POSSIBLY...
65.
65 METERS DEEP.
NOW, THE SHARK
             IS LIKE 37 METERS.
IT'S GETTING A LITTLE
 BIT SHALLOWER NOW.
OKAY, LET ME --
TAKE IT.
IT SEEMS THAT IT'S GOING
          RIGHT TO TWIN CANYONS.
I CAN SEE YOUR LIGHT.
SO MAYBE IT'S VERY CLOSE
                TO YOU. OVER.
BUT THERE'S ANOTHER SHARK,
            THOUGH, ANOTHER ONE.
YEAH. I IMAGINE THESE SHARKS
ARE IN HUNT MODE RIGHT NOW.
THEY'RE PROBABLY USING
THIS FULL MOON THE SAME WAY
THAT THE SHARKS
    USE DAYLIGHT.
Massyn: THESE SHARKS
         ARE EVERYWHERE!
ANOTHER ONE! ANOTHER ONE!
IT SEEMS LIKE THEY'RE
     IN HUNT MODE, FOR SURE.
DEVON, WE'RE GETTING TWO
DIFFERENT TRANSMITTER SIGNALS.
SO IF YOU'RE SEEING SHARKS
THAT DON'T HAVE TRANSMITTERS,
THEN THAT'S EVEN MORE THAN
YOU'RE LOOKING AT, THEN.
THERE'S PLENTY OF SHARKS
     STACKING UP
DOWN THERE RIGHT NOW.
SEVERAL SHARKS DOWN HERE.
THIS IS AMAZING. THIS IS
EXACTLY WHAT YOU WERE SAYING.
THE SHARKS ARE MOVING
INTO SHALLOWER WATER AT NIGHT
USING THE FULL MOON
 TO HUNT, IT SEEMS.
IT'S AMAZING TO SEE.
♪♪
Narrator:
  THE TEAM CAPTURES VIDEO DATA
OF WHITE SHARKS AGGREGATING
       IN SHALLOW WATERS.
Hoyos: IT'S INTERESTING
      THAT WE ARE GATHERING
ALL THE PIECES FROM THE PUZZLE.
WE ARE GETTING TO KNOW
         A LOT OF THINGS
ABOUT THIS ANIMAL
     AND THE IMPORTANT ROLE
THAT THEY PLAY
    IN THE MARINE ECOSYSTEM.
Johnson: THEY CAN ADAPT
      TO THEIR ENVIRONMENT.
THEY CAN DEVELOP
         NEW STRATEGIES
DEPENDING ON
      THE LOCAL PREY ITEMS.
THESE SHARKS ARE USING
         THE CLEAR WATER
AND THE EXTRA LIGHT
        OF THE FULL MOON
TO MOVE INTO SHALLOWER DEPTHS
AND HUNT THEIR PREY ITEMS THERE.
SHARKS HAVE BEEN
     OCCUPYING SHALLOW WATER
AND FEEDING FOR THOUSANDS
      TO MILLIONS OF YEARS.
BUT THESE DAYS,
      WE ARE NOW SEEING IT
BECAUSE WE HAVE
  THE TECHNIQUES TO PHOTOGRAPH
AND SPREAD THE INFORMATION.
AND THEY'VE ALWAYS BEEN THERE.
WE CAN ACTUALLY SEE THEM NOW.
Narrator:
      WHILE MANY BEHAVIORS
OF GREAT WHITES AND HAMMERHEADS
        REMAIN A MYSTERY,
ONE THING IS CLEAR --
THIS SHALLOW WATER INVASION
       HAS BEEN HAPPENING
ALONGSIDE HUMANS
    FOR THOUSANDS OF YEARS...
-OHH!
              -OHH!
...AND SCIENCE IS JUST STARTING
       TO CRACK THE CODE.
