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Shark Pit Diving | National Geographic


far out in the Indian Ocean two men

far out in the Indian Ocean two men search for sharks

QV tree is a dive guide and naturalist

QV tree is a dive guide and naturalist Rian Johnson is a shark scientist their

Rian Johnson is a shark scientist their

Rian Johnson is a shark scientist their dive site is a labyrinth of reefs

dive site is a labyrinth of reefs

dive site is a labyrinth of reefs caverns and caves and it holds a special

caverns and caves and it holds a special

caverns and caves and it holds a special secret unusual sunken pits that look

secret unusual sunken pits that look

secret unusual sunken pits that look like they’ve been carved by giant

like they’ve been carved by giant

like they’ve been carved by giant whirlpools these places are special they

whirlpools these places are special they

whirlpools these places are special they hold a magnetic attraction to sharks

hold a magnetic attraction to sharks

hold a magnetic attraction to sharks huge numbers of sharks the very shape of

huge numbers of sharks the very shape of

huge numbers of sharks the very shape of these pits channel’s the water into

these pits channel’s the water into

these pits channel’s the water into violent vortices bad for divers but good

violent vortices bad for divers but good

violent vortices bad for divers but good for sharks but what exactly attracts the

for sharks but what exactly attracts the

for sharks but what exactly attracts the Sharks remains a mystery at the base of

Sharks remains a mystery at the base of

Sharks remains a mystery at the base of the pit lies an entrance tunnel like a

the pit lies an entrance tunnel like a

the pit lies an entrance tunnel like a secret passage at the end of the town a

secret passage at the end of the town a

secret passage at the end of the town a chamber of light

Hugh calls this the cathedral bid it is

Hugh calls this the cathedral bid it is like God talking to you and then a pair

like God talking to you and then a pair

like God talking to you and then a pair appears right in the cathedrals

appears right in the cathedrals

appears right in the cathedrals floodlights

floodlights

floodlights soon followed by another one and then a

soon followed by another one and then a

soon followed by another one and then a large and very pregnant female shark

large and very pregnant female shark

large and very pregnant female shark arrives on the scene to see a breeding

arrives on the scene to see a breeding

arrives on the scene to see a breeding pair and a pregnant female is an

pair and a pregnant female is an

pair and a pregnant female is an excellent sign it’s much harder tagging

excellent sign it’s much harder tagging

excellent sign it’s much harder tagging sharks like these I’m used to big great

sharks like these I’m used to big great

sharks like these I’m used to big great white sharks who aren’t afraid of coming

white sharks who aren’t afraid of coming

white sharks who aren’t afraid of coming close one shark is bolder than the rest

close one shark is bolder than the rest

close one shark is bolder than the rest and comes close success

and then another the tag doesn’t harm

and then another the tag doesn’t harm the shark and the animal gets used to it

the shark and the animal gets used to it

the shark and the animal gets used to it quickly the tag will allow me to follow

quickly the tag will allow me to follow

quickly the tag will allow me to follow the shocks when they leave the pit each

the shocks when they leave the pit each

the shocks when they leave the pit each tag gives off a radio signal that he can

tag gives off a radio signal that he can

tag gives off a radio signal that he can pick up on his topside receiver

they’ll follow the shark all day if

they’ll follow the shark all day if necessary she completes her journey

necessary she completes her journey

necessary she completes her journey three miles away and rests and then

three miles away and rests and then

three miles away and rests and then sharks swimming down the channel – they

sharks swimming down the channel – they

sharks swimming down the channel – they must swim fast to keep up the Sharks

must swim fast to keep up the Sharks

must swim fast to keep up the Sharks lead them over a wall and into another

lead them over a wall and into another

lead them over a wall and into another shark pit

everywhere they look sharks 50 60 70

everywhere they look sharks 50 60 70 sharks looks like it is a nursery

sharks looks like it is a nursery

sharks looks like it is a nursery because it is only young sharks here

because it is only young sharks here

because it is only young sharks here that’s incredible I can see the shot

that’s incredible I can see the shot

that’s incredible I can see the shot that you tagged over there it’s the

that you tagged over there it’s the

that you tagged over there it’s the shark from the cathedral and another

shark from the cathedral and another

shark from the cathedral and another arrival from Cathedral it’s clear the

arrival from Cathedral it’s clear the

arrival from Cathedral it’s clear the Sharks are moving between the pits up

Sharks are moving between the pits up

Sharks are moving between the pits up above the surface of the basin pit is

above the surface of the basin pit is

above the surface of the basin pit is churning the foaming water attracts the

churning the foaming water attracts the

churning the foaming water attracts the Sharks something Hugh has noticed in all

Sharks something Hugh has noticed in all

Sharks something Hugh has noticed in all the shark pits few suspects there’s a

the shark pits few suspects there’s a

the shark pits few suspects there’s a good reason why the Sharks like this

good reason why the Sharks like this

good reason why the Sharks like this foaming water I think that all those

foaming water I think that all those

foaming water I think that all those bubbles in the water bring extra oxygen

bubbles in the water bring extra oxygen

bubbles in the water bring extra oxygen into the bit could this explain why the

into the bit could this explain why the

into the bit could this explain why the Sharks like these pits a lot of sharks

Sharks like these pits a lot of sharks

Sharks like these pits a lot of sharks including the black tails have to

including the black tails have to

including the black tails have to continuously swim to breathe

continuously swim to breathe

continuously swim to breathe so if it is a situation that within the

so if it is a situation that within the

so if it is a situation that within the pit there are high levels of dissolved

pit there are high levels of dissolved

pit there are high levels of dissolved oxygen it might give them a greater

oxygen it might give them a greater

oxygen it might give them a greater chance to rest they don’t have to swim

chance to rest they don’t have to swim

chance to rest they don’t have to swim quite so much to get the same amount of

quite so much to get the same amount of

quite so much to get the same amount of oxygen Ryan needs to sample water from

oxygen Ryan needs to sample water from

oxygen Ryan needs to sample water from all the shark pits

what’s going on is that these waves are

what’s going on is that these waves are crashing up against the island and it

crashing up against the island and it

crashing up against the island and it hits the rocks and all this oxygen-rich

hits the rocks and all this oxygen-rich

hits the rocks and all this oxygen-rich water gets shot down right into the pit

water gets shot down right into the pit

water gets shot down right into the pit that’s what the Sharks love that’s what

that’s what the Sharks love that’s what

that’s what the Sharks love that’s what they seem to be looking for back at the

they seem to be looking for back at the

they seem to be looking for back at the dive headquarters

dive headquarters

dive headquarters Ryan checks to see if his results

Ryan checks to see if his results

Ryan checks to see if his results confirm his theory when I first hopped

confirm his theory when I first hopped

confirm his theory when I first hopped into the water outside of the pits while

into the water outside of the pits while

into the water outside of the pits while swimming through these normal levels of

swimming through these normal levels of

swimming through these normal levels of dissolved oxygen but as I swam into the

dissolved oxygen but as I swam into the

dissolved oxygen but as I swam into the pits the levels of oxygen increased

pits the levels of oxygen increased

pits the levels of oxygen increased around four to five percent so it seems

around four to five percent so it seems

around four to five percent so it seems that this almost Jacuzzi of super

that this almost Jacuzzi of super

that this almost Jacuzzi of super oxygenated water is what’s drawing all

oxygenated water is what’s drawing all

oxygenated water is what’s drawing all these sharks into the pits so Hugh was

these sharks into the pits so Hugh was

these sharks into the pits so Hugh was right after all

Hugh and Ryan’s expedition has unlocked

Hugh and Ryan’s expedition has unlocked some of the mysteries surrounding this

some of the mysteries surrounding this

some of the mysteries surrounding this very special hidden world there is no

very special hidden world there is no

very special hidden world there is no doubt that these pits are critical

doubt that these pits are critical

doubt that these pits are critical habitat for the local survival the shark

habitat for the local survival the shark

habitat for the local survival the shark species I want to keep those places

species I want to keep those places

species I want to keep those places where we have seen the shops I want to

where we have seen the shops I want to

where we have seen the shops I want to keep them secret because I want this

keep them secret because I want this

keep them secret because I want this shop to be at peace

shop to be at peace

shop to be at peace for now the location of the shark pits

for now the location of the shark pits

for now the location of the shark pits will be Hugh’s secret

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