Despite sharing a name, survival and survival horror are two very different genres. In survival horror, the threat comes from outside the player – a Xenomorph stalking the corridors of a ship, or a killer with giant scissors chasing you through a clock tower. In survival games, the tension is more internal, as you race against your own needs before you succumb to the harsh environment.

And yet, one game manages to take these two very different genres and combine them perfectly. It has the conquering nature aspects of survival, but also the abject terror of survival horror. Subnautica is the best survival game, and the best survival horror game.

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Your first few dives into the oceans of Planet 456B are simple enough. Oceans are inherently creepy, but with farting manatee-things and adorable cuddlefish, there’s nothing too scary going on. You swim around, slash some outcrops with your knife, and start the usual survival grind of finding food and water.

The survival in Subnautica is simple, but as deep as its ocean. On top of hunger and thirst, you also have to tackle your limited oxygen supply, viral infection, and even water pressure by upgrading your equipment to descend deeper into the depths. Go too deep too soon, and your air will run out a lot quicker. That, or you’ll be eaten by something awful.

Subnautica Base

Before long, though, you become a master of the seas. You build a complex tree of air pipes to breathe as you delve deeper into caves and tunnels. You build flippers and enhanced oxygen tanks. You even set up an underwater base.

It spreads quickly, filling up with a fleet of vehicles, observation decks, and even aquariums to store the planet’s native life for research. Subnautica doesn’t just challenge you to survive, it eggs you on to thrive, like a modern-day Captain Nemo. To build out, to see how far you can push the environment, to lull you into a false sense of security.

Stalker in Kelp Forest

But then you need to head over into another biome, and things take a sharp turn for the worse. Your first encounter with a hostile enemy flips a switch for Subnautica.

You’re no longer gallivanting around a pretty Frutiger aero-type seascape, you’re in alien territory and at risk of becoming some sea-monster’s lunch. Layered on top of your hunger and thirst is something much, much more horrifying. All the confidence you gained in the early hours is stripped away and replaced with the real horror of the game.

Reaper in the distance

At first, it’s just a little stalker in the kelp forests. Blinded by the vines, you’re surrounded by snapping jaws and thinking it’s the worst thing that has ever happened to anybody ever. But they’re the slamming vent in Alien: Isolation, or the spooky jumpscares in Alan Wake 2. They’re harmless, designed to get your heartrate up before the big boys enter the fray, and you have no idea just how bad things are going to get.

I’ll never forget my first encounter with a Reaper Leviathan. I thought I’d seen everything, and decided to stray a little too close to the gigantic crashed spaceship. The muted groaning of the reefbacks gave way to distant roaring. Then louder roaring.

Subnautica Dragon 3

Then, as I was picking some debris off the seafloor, a shadow passed over me. The reaper was about to kill me, and I’ve never come so close to soiling myself and polluting the water as I did then.

The genius of Subnautica is that it makes you forget two key facts. By having the game be set entirely underwater, you become acclimated to it even though water levels in any other game are terrifying.

And because you’re often swimming through compact tunnels in shallow water, your first few hours also numb you to the potential scale of the game. Subnautica loves throwing mind-bogglingly big things at you as its main source of horror, and the Reaper Leviathan is your first, but by no means only, harsh awakening to just how small you are on Planet 456B.

Now firmly disillusioned that you’re not the big dogfish, even the things you were doing before become terrifying. A new cave system could be hiding a swarm of Ghost Leviathans – or the skeleton of a Gargantuan Leviathan to show that even the monsters you’re facing today are nothing compared to what could be out in the void. The ship is a radioactive nightmare of crabs and reapers. Everything is awful, and it’s utterly brilliant.

Subnautica marries survival and survival horror together in a way no other game has managed. Survival games can be scary, but they’re fleeting moments – an encounter with a spider in Grounded, or the panic of a distant gunshot in DayZ. Subnautica ishorror.It’s a creeping, gut-wrenching fear that never lets up, and only gets stronger the bigger the enemies get and the deeper you swim.

But it teaches survival horror a thing or two, as well. Subnautica never goes for the cheap scares. There’s no scripted jumpscares, everything that happens to you is just part of being part of this ecosystem where you firmly don’t belong. The horror is organic and natural, having faith enough in the fright of its own subject matter to speak for itself.

Survival Week at TheGamer is brought to you by Nightingale -available on PC in early access February 20