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Luyện nghe/Video/National Geographic/Behind the Shot: Rebreather #HammerheadSharksUpClose

Behind the Shot: Rebreather #HammerheadSharksUpClose

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0:00In Hammerhead Sharks Up Close, we're
0:01bringing you right into the world of the
0:04Hammerhead.
0:08We went to an incredible archipelago
0:11called the Rei Heekiedo Islands. You get
0:1310 points if you can spell that without
0:15looking it up. It's a magical group of
0:18islands that have a population of
0:20scalloped hammerhead sharks.
0:21>> Oh, look. Hammerhead sharks are
0:24incredibly shy.
0:25>> Surely there's hammerheads nearby. So,
0:27you really have to play hide-and-seek
0:29with them.
0:30>> Positive pressure test.
0:32>> A key piece of equipment we used was
0:34called the rebreather. Unlike
0:36traditional scuba diving equipment that
0:38makes bubbles, a rebreather recycles
0:41your air. So, when you breathe out, a
0:43bit of oxygen is added and then that
0:45same breath is given back to you through
0:47another hose.
0:48>> That way, we got to go that way.
0:51>> And that is useful for two reasons.
0:54Because you're recycling your air, you
0:55can stay down way longer. you can become
0:57part of the environment
0:59>> right inside the school.
1:02>> The other reason is that you're not
1:03making noisy bubbles.
1:07>> The way they just appear out of the
1:09gloom, it's so ethereal.
1:12>> I've been fortunate enough to film
1:14hammerhead sharks all around the world.
1:16I have never had an experience with
1:19hammerhead sharks like the one that I
1:20had at the Revy Hickey Islands. And that
1:23is a dive that will be etched into my
1:26memory for a very long time.