Image credit: Unknown Worlds It's an accepted reality of horror - be it in video games or elsewhere - that things are more daunting when you're alone. The stakes may lessen in a group, the threat may diminish. The same is true of survival games, where extra hands can construct a base or fend off a threat in a fraction of the time of a solo player. So what happens when a popular survival game, known for lurking dangers deep in the ocean, opens the door to four-player co-op? The team at Unknown Worlds Entertainment, the studio behind Subnautica 2 , has faced this dilemma head-on. Co-op has long-since been high on the original game community's wishlist, but what had to be changed within the Subnautica formula to make it work? Here's the Subnautica 2 Early Access release date trailer.…