https://www.cnet.com/news/headless-chicken-monster-filmed-near-antarctica-for-the-first-time/

For the first time, scientists in the Australian Antarctic Division have caught the rare marine creature on camera, posting a video to YouTube on Sunday, in the Southern Ocean off the coast of East Antarctica. The swimming sea cucumber, known more formally as enypniastes eximia, has been filmed only once before in the Gulf of Mexico.

The "headless chicken monster" name is no overstatement. The scarlet-coloured sea cucumber has wing-like webbing on its sides that it uses to swim, and where you might expect a head, there's nothing but a circular ring of tentacles that gives the impression it's just met with the chopping block.