I remember seeing this or similar footage about a year ago. Numerous debates raged on YouTube over what the creatures were as the reporters and various stories referred to them as sea spiders. I remember some folks insisting I was wrong.

I tried to infer what the taxa is at one point, but can’t remember how far I got. A common comatulid crinoid in that region is Promachocrinus kerguelensis, but I’d need to see one of these up closer to tell for sure.