And holy cow t#ts. It's scary.
http://xboxdvr.com/gamer/Tigerstorm6/video/36243516
Best guess is that it's related to the hive. As far as I'm aware, no creature can survive in methane oceans in our solar system.
Plus it's super similar to the hive worms on the Dreadnaught.
Regardless, I shit myself when I saw it...
-
You all are wrong, Titan is actually Fundament, The hive homeworld. The creature you saw is the Levaithan, the oldest creature alive. My information is from the Books of Sorrow. One of the three Osmium sisters put the Leviathan in a glass containment as a result for making the sisters choose death over immortality.