OceanX close-up footage of giant sharks trying to devour the submersible's outer spear

The spear that sharks are "inspecting" is specifically designed to attach satellite tags to creatures as they swim in their natural habitat. OceanX made history in late June, when it first marked a shark with a submersible. Previously, researchers could only label blunt-nosed six-gill sharks by bringing them to the surface, a process that could put pressure on deep-sea animals.

The OceanX team wrote: "Typically, data obtained after the surface marking of the sixgill shark is considered inaccurate because the shark did not return to its natural behavior for a period of time after marking."

Although the blunt-nosed six-gill shark is huge, it may not be as well-known as the great white shark. It tends to stay in the depths of the dark ocean. The Florida Museum said: "People don't know much about this, and unless it's provoked, it's not a threat to humanity."

OceanX video presents for the first time a rare up-close look at this awesome behemoth. According to the Florida Museum's International Shark Attack Archive, there has only been one record of an attack on humans by a blunt-nosed six-gill shark since the 16th century, also in cases where sharks were provoked.