Not only that, but the documentary is actually pretty damn good.
I'm not sure how scientific this video by 8-BIT BASTARD, and it kind of doesn't matter. It's great to watch the marine wildlife just do its thing, and to listen to 8-BIT BASTARD come up with rationalizations for why everything acts the way it does. I'm especially amused by what happens when he finds the remains of a prehistoric creature.
According to this, almost everything in the waters of GTA V are starving. Cripes!
GTA 5 Wildlife Documentary | Into The Deep [8-Bit Bastard]