[DRAMATIC MUSIC]
NARRATOR: We've just
mounted one of many cameras
deep in these treacherous
South African waters as we
search for the lost
whitetip weasel shark.
[SUSPENSEFUL MUSIC]
NARRATOR: The bait
from our cameras
has attracted a hungry bull.
They've got the most
testosterone of any shark.
Thankfully, it's distracted
enough for us to ascend,
but we need to stop for
a bit to decompress.
 Dive in from there, yeah.
NARRATOR: These pesky little
silver tips are trying
to get one last nip at me.
MARK ROMANOV: We're over a mile
from where we were supposed
to be at the end of that dive.
 Between 22-- in 20 minutes.
NARRATOR: Those
eight-knot currents
pushed us into a much deeper
area than we planned for.
 So we both came up
with terrible headaches.
We went way below
our dive profiles,
so sipping on some oxygen
hoping it clears the headaches
and keeps us from
getting injured.
[DRAMATIC MUSIC]
NARRATOR: After a couple more
days of placing and collecting
grubs in targeted areas, we've
got over 350 hours of footage.
It's a potential treasure
trove of scientific data
that we're hoping could reveal
the lost whitetip weasel shark.
 Hmm, we've got a shark.
This appears to be a
short-tail nurse shark.
This animal is only known
to range up north of here
like 500 miles,
up near Zanzibar.
NARRATOR: This shark has never
been seen this far south.
It's a new discovery
for shark science.
 It's not, a lost shark but its
new distribution, a new species
known as South African waters.
I mean, just really cool.
[MUSIC PLAYING]
Got something here, guys.
[DRAMATIC MUSIC]
You can just see it
off in the distance,
this hazy, sandy area.
[DRAMATIC MUSIC]
That looks like it could be
a weasel shark, right here.
[MUSIC PLAYING]
The whitetip weasel shark
making it very unique
has both white fin
edges and this black tip
on its second dorsal.
And that's what I think
I'm seeing in this footage.
I'm seeing the white
tips on the fins.
I'm seeing the very mobile tail
and rigid, long, slender body.
If this is a whitetip
weasel shark,
this would be the
first time in 35 years
that one has been seen
and the first time
in history that a live
one has ever been filmed.
[MUSIC PLAYING]
