Deep Blue (The biggest shark ever filmed) second partAnother DEEP BLUE VIDEO!!!!(Please read below about our fundraising campaign)Otro video de DEEP BLUE!!!!(Por favor lean el enlace de abajo acerca de nuestro proyecto) Posted by Mauricio Hoyos Padilla on Monday, August 10, 2015

The video comes from Mauricio Hoyos Padilla, a shark expert from the Mexico-based shark conservation and research non-governmental organization known as Pelagios-Kakunjá. Padilla guesses that the 20-something-foot shark is the largest ever caught on camera.

Padilla, who released an earlier Deep Blue video in June, said in a statement accompanying the new video that a shark of this size must be more than 50 years old. Deep Blue's appearance, he added, "tells me protection and conservation efforts are really working."

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However, Padilla is concerned that Deep Blue will soon find herself in danger, when the pregnant female leaves the relative safety of Guadalupe Island and heads toward the more shallow coastal areas where great whites give birth.

The nursery areas are "full of food and free of predators," he writes. But, he adds, "these areas are close to shore and very vulnerable to several human threats." Padilla and his team are at Guadalupe this summer to tag the pregnant females living there, in order to track them to their nursery grounds. The idea is to learn more about the shores where sharks give birth, in order to recommend better protection policies.

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LiveScience spoke with Padilla in June, after a video was released showing Deep Blue appearing to high-five a diver. (The diver was, in fact, trying to push the shark away from the diving cage's sharp edges.)

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Here, according to the LiveScience piece, is how Padilla and other researchers first found her:

He has been studying sharks off Guadalupe Island, off the coast of Mexico, for about 13 years. The island is known as a great white shark breeding ground in the Pacific Ocean. Hoyos Padilla had a new hypothesis that the pregnant females would wait for elephant seals to arrive in the waters there in November and December, so the sharks could ambush the seals for sustenance. He found the female sharks could ambush the seals at a depth of 330 feet (100 meters). For his study he needed to observe pregnant female sharks, so he asked operators of ecotourism boats in the area to keep an eye out and contact him if they spotted one. Sure enough, a friend and dive master contacted him with Deep Blue's whereabouts.

Last year was the first time the shark and the researcher encountered each other. That footage ended up airing during Discovery Channel's Shark Week. Researchers have tagged Deep Blue with a transponder, so she's much easier to find.

Great whites are listed as "vulnerable" on the International Union for Conservation of Nature's Red List, meaning that the global conservation group believes the species is likely to become endangered unless conditions improve. Although the sharks live across the world's oceans, they also face widespread threats, especially from humans.

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"Threats to the species include targeted commercial and sports fisheries for jaws, fins, game records and for aquarium display; protective beach meshing; media-fanned campaigns to kill Great White Sharks after a biting incident occurs; and degradation of inshore habitats used as pupping and nursery grounds."

Here's another look at Deep Blue:

DEEP BLUEI give you the biggest white shark ever seen in front of the cages in Guadalupe Island....DEEP BLUE!!!Este es el tiburón blanco mas grande visto desde las jaulas en Isla Guadalupe...DEEP BLUE!!! Posted by Mauricio Hoyos Padilla on Tuesday, June 9, 2015