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...
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But this isn't the same thing as the creature swimming in the ocean from the looks of it. There's two giant creatures then? The thing I saw swimming right outside behind Sloane was long and slender with jagged spinal fin.