We’ve had the giant carnivorous Bobbit worm burrowing its way into nightmares across the nation and now spider crabs are haunting the Blue Planet II audience. That’s right: SPIDER crabs.

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Episode four saw hundreds of thousands of the beasts emerge from the depths of the ocean to moult their exoskeletons in 100 metre long crowds.

“They’re not seeking mates, neither are they laying eggs. They have come here in order to grow,” explained narrator David Attenborough. “Like all crabs, their bodies are encased in a hard unexpandable shell, so to grow they have to break out of it.”

https://twitter.com/BBCEarth/status/934104331007045632

Viewers found the sequence seriously creepy...

https://twitter.com/m_mason238/status/934881343024050177

https://twitter.com/WillParry5/status/934882581463666689

https://twitter.com/Derek_Faye/status/934881337122742273

And now nobody's going near the sea again.

https://twitter.com/JameyJackson/status/934997238857773058

https://twitter.com/ohmydoshUK/status/934881676433526785

https://twitter.com/18madnextdoor/status/935042305031069696

https://twitter.com/jonhollingfm/status/935040035786764288

However, some couldn’t help wonder if there was more to the creatures than met the eye…

https://twitter.com/OpenMindMH/status/934883366956134401

https://twitter.com/SnoozeInBrief/status/934881714878533632

https://twitter.com/mrmitchell78/status/934881582845964288

If for some reason you think you can stomach another look at that mountain of crabs, you can find out how the Blue Planet II crew filmed the epic scene here.

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Blue Planet II continues 8pm Sunday night, BBC1

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