You mean, “Grave of the Ocean King?”
Or - ‘Space Whale’ by Beau Lamb?
Behold! — The Concept Art that was released shortly before game released. — Could it be?
Otherwise…
There is the more popular alternative…
To date, the above 2016 Star Citizen footage does not yet exist in-game. — When?
I GOT AN IDEA : Star Citizen promised them, and now NMS can deliver them! 
It’s about time for some ‘PROCEDURAL BIG BOSSES.’ 
Here’s for hoping!