Had a cool unscripted moment in my first 10 minutes of checking out the Abyss update last night. I build the new mini-sub and head down to the first abandoned building the quest points me to, head inside and find the spooky log, but when I come back out I see... fish, stunned or dead, floating slowly down to the ocean floor. I look up ~30m and see three massive shark-eels in a feeding frenzy.
Hopped in my sub and sped away, staying low to avoid their notice.
Game designer tangent: the point of having emergent things in your game is less to create a sense of constant surprise, treating systems as a generator of the unexpected that must by necessity wind down eventually, and more to slowly build a world that is surprising on first contact but consistent and learnable over time. With the above story, I now know how to better sense ocean predators.